The Wildlife Acoustics MINI BAT 2
Static bat recorders for on-site deployment
Full spectrum & zero crossing bat recorders
Call me on 0333 9000 927 for a chat
The MINI BAT has my 60 day 100% Satisfaction Guarantee & extra year's warranty

Hi there,

What can I say about the Wildlife Acoustics MINI BAT 2? (Mini BAT 2 & Mini Acoustic available below)

If you're looking for a static full spectrum recorder to leave out on site, the Wildlife Acoustics SM4BAT FS & MINI BAT 2, the Anabat Swift, the Pettersson D500X and the Elekon Batlogger C are the ones to consider. There's now also the Chorus, that like the Mini Bat can be configured to record bats at night and birds/frogs during the day, or the Ranger that can record bats and birds/frogs at the same time.

All units record bat calls very efficiently, but the main consideration is going to be deployment times. The Batlogger C can last for 5 nights with the single included battery or 10 nights with the optional additional battery. The D500X can last for 14 nights. The SM4BAT FS and Anabat Swift can last for up to 30 nights. The MINI BAT 2 can last for 50 nights on four AA alkaline batteries (over 200 nights with eight 18650 lithium ion batteries). The Chorus can last for 300 hours (acoustic) or 400 hours / 40 nights (ultrasonic). The Ranger can last for 700 hours (acoustic) or 1000 hours / 100 nights (ultrasonic)

I thoroughly recommend the SM4BAT FS, Ranger or MINI BAT 2 for their long deployment times and ease of use. If you want to record audible species as well as ultrasonic, the Mini Bat 2, Ranger and Chorus are the ones to look at.

With the SM4BAT FS, Ranger, Batlogger C & D500X you'll also get a free bat calls book worth £30: either British Bat Calls by Jon Russ, Social Calls of the Bats of Britain and Ireland by Neil Middleton et al, Bats of Britain & Europe by Christian Dietz & Andreas Kiefer, Is That a Bat? by Neil Middleton or a £30 voucher.

I want you to be 100% happy with your purchase so call me on 0333 9000 927 for advice.

Warm Regards,


New Mini Bat 2 - order below now!

Mini Bat 2 is available in two versions, for AA batteries or for 18650 rechargeable li-ion batteries.

From conducting bat species inventory and presence/absence surveys to detecting endangered species and monitoring habitat health, the Song Meter Mini Bat 2 recorders detect and capture quality ultrasonic vocalisations at a breakthrough price.

Comparable recording quality to the industry standard Song Meter SM4BAT
Records in Full Spectrum and/or Zero Crossing
Lightweight, at just 0.93 lb/424 g (including batteries)
The smallest ultrasonic bat recorder available, at just 4.7" x 5.6" x 1.6" (120 mm x 142 mm x 40 mm)
Weatherproof design suitable for any environment
Low-noise microphone detects and captures more bat recordings
Advanced triggering records only when bats are present
Optional noise scrubber automatically deletes false triggers that do not contain bat vocalizations
Change settings and schedule wirelessly via Bluetooth on your mobile device
Automatically sends recorder status to the app via Bluetooth
Uses your mobile device to set date, time, time zone and location
Optional acoustic microphone attachment allows you to also record birds, frogs and other vocal wildlife
Record up to 50 ten-hour nights with 4 AA batteries (or 200+ ten-hour nights with 6 lithium-ion batteries)
Compatible with Kaleidoscope Pro software to quickly review recordings and automatically suggest bat species in North America, Europe, South Africa, and the Neotropics.
Affordably priced, including one built-in ultrasonic microphone

ACCESSORIES - see below

Acoustic Microphone Stub for Mini & Mini 2 Family
Add to Song Meter Mini Bat/Mini Bat 2 to record bird and land animals when not recording bats.

Song Meter Mini Security Bracket
Steel, lockable security bracket for Song Meter Mini family of recorders (not Mini 2)

Lithium-ion 18650 batteries (one pair) for MINI family recorders with Lithium Lid, or Mini 2 li-ion family
Special shipping and handling fees may apply. No returns due to regulations on shipment of Li-ion batteries.

Lithium-ion Battery Charger
Lithium-ion Battery Charger for 18650 batteries.
Replacement Windscreens
One pair. Includes clips

Ultrasonic Calibrator for Ultrasonic Microphones

The Mini Configurator app will work with most smartphones or tablets that run either iOS 12 or later, or Android 8.0 or later. The one major exception we've found is Android devices produced by Huawei, which do not use the same Bluetooth implementation as other major Android manufacturers.


Recording Format: Full Spectrum and/or Zero Crossing
Channels: 1 built-in waterproof ultrasonic microphone
optional second acoustic microphone for recording birds, frogs and other wildlife
NOTE: The Song Meter Mini Bat 2 can be programmed to record ultrasonic activity at some times and non-ultrasonic acoustic activity at other times during the same deployment, but not simultaneously.
Sample Rates
Ultrasonic: 192kHz, 256kHz, 384kHz, and 500kHz
Acoustic (with optional acoustic microphone): 8kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 96kHz
NOTE: Specifications for acoustic recording is identical to the Song Meter Mini 2 model.
Power Options: 4 or 8 AA Alkaline/NiMH batteries (AA model) / 1-6 Li-ion 18650 batteries (Li-ion model)
Run Time: Up to 50 10-hour nights (AA model) / Up to 125 10-hour nights (Li-ion model)
Storage: 1 SDHC/SDXC card (up to 1 TB)
Dimensions - Height: 4.7" / 120 mm; Width: 5.6" / 142 mm; Depth: 1.6" / 40 mm
Weight (AA model)Without Batteries: 0.53 lb / 240g; With All Batteries: 0.93 lb / 424g
Weight (Li-ion model) - Without Batteries: 0.51 lb / 231g; With All Batteries: 1.14 lb / 517g
Enclosure Material: IP67-rated Polycarbonate Housing
Enclosure Environmental Protection: Fully weatherproof
Operating Temperature: -4°F to +185°F or -20°C to 85°C
Warranty: 2 years (3 years if bought from us) - microphones 2 years
The MINI BAT 2 is only £740 or £770 with SanDisk 128GB SDXC card and AA alkaline batteries (18650 li-ion option also available).
60 day 100% Satisfaction Guarantee and exclusive 3 year warranty.
Prices include UK delivery & VAT
(non-UK delivery will be charged at cost after purchase and we can supply without VAT)
Does not include analysis software! Check out Kaleidoscope software
For orders to be shipped outside the UK, please email to get prices.

Compact, lightweight, single-channel bat detector and recorder.

Developed specifically for bat research, the SM4BAT recorders combine innovative design with a new low-power processor and easy-to-use scheduling features. Available in full-spectrum and zero-crossing models, the SM4BAT will make bat research simpler, faster, less costly and more reliable. The SM4BAT FS creates high-quality, full-spectrum recordings that can be easily converted to zero-crossing recordings using free Kaleidoscope conversion software. The SM4BAT ZC creates zero-crossing files that optimize power and data storage.

Small, secure and weatherproof.

Designed around the footprint of 4 D-size batteries and made of rugged polycarbonate, the SM4BAT is less than half the weight and size of the SM3BAT. The integrated mounting bracket and weatherproof security cover keep the unit safe and dry in the most punishing environments.

Longest deployment times available.

The new, low-power microprocessor, combined with 4 D-size batteries, enable the longest deployment times of any other bat recorder available. The SM4BAT FS has a recording run time of 300 to 500 hours depending on bat activity and other factors. The SM4BAT ZC run time is even longer. See Specifications for details.

Easy to program.

To get you started quickly, the SM4BAT features a brand new, easy-to-use, Quick Start menu and Scheduler. Use built-in schedules, or customize them for your specific recording needs.

Available GPS accessory to set clock and location.

When deploying multiple recorders, use a single GPS accessory to automatically set the date, time and location settings of all recorders. The GPS accessory can also be attached to log the recording locations and path for mobile transects.

Recording Technology: Single-channel

SM4BAT FS: 16-bit .wav

SM4BAT ZC: Zero-Crossing

Sample Rates: Full-Spectrum, single-channel, 256kHz, 384kHz, 500kHz

Run-Time: SM4BAT FS: 300-500 hours, depending on bat activity, SM4BAT ZC: 500 hours (NOTE: SM4BAT FS and ZC run times can vary by as much as 50% depending on the characteristics of specific brands and models of flash cards, the kind and quality of batteries used (alkaline versus rechargeable), temperature and configuration. We recommend SanDisk brand SDHC/SDXC cards.)

Power Options: Internal power using 4 D-size alkaline (included) or NiHM batteries; External power via optional SM3/SM4 Power Cable

Storage: 2 SDHC/SDXC flash card slots (Class 4 or greater)* More than 1 terabyte total capacity using 2 512GB SDXC cards* (I recommend using SanDisk SDHC/SDXC cards and I include 2 128GB SDXC cards in the complete bundle).

Height: 8.6"/21.8 cm; Width: 5.9"/ 15.0 cm; Depth: 2.8/7.1 cm; Weight: 1.4 lbs./.64kg without batteries, 2.7 lbs./1.2kg with batteries

Enclosure Material: Polycarbonate

Operating Temperature: -4°F to +122°F or -20°C to 50°C

Warranty: 3 years (4 years if you buy from me)

If you're not sure whether the SM4BAT FS is the one for you, just give me a call on 0333 9000 927 and I'll loan you mine to see if you like it.

Download SM4BAT FS User Guide - English - Spanish (Manual de usuario) - German (Bedienungsanleitung) - Chinese (用户指南)French (Guide de l'utilisateur)Japanese

The SM3BAT and SM4BAT FS implement a serial communications interface in support of wind energy SCADA systems to report possible bat activity. With firmware version 1.3.3 and later of the SM3BAT, or SM4BAT FS recorders produced with serial numbers greater than S4U06942 (shipped on or after March 12, 2019), the recorder responds to serial requests with information including cumulative number of bat passes and pulses detected as well as timestamp, voltage, temperature, and flash card capacity information.

Download more information

New Products to protect your Song Meters and the SMM-U2 microphone from electrical surges! 
o   The Song Meter Surge Suppressor protects SM4/SM4BAT and SM3/SM3BAT recorders from power surges that could harm your recorders. This accessory should be used wherever microphones are mounted at elevation.

o   If you’ve mounted your SM4BAT and SMM-U2 to a metrology tower, wind turbine or some mounting point several feet off the ground, the SMM-U2 Grounding Bracket protects the SMM-U2 microphone from electrical surges that could damage the microphone and recorder.

1. Quick Start
2. Overview
3. Audio Settings
4. Settings Part Two
5. Daily Recording Schedules
6. Advanced Recording Schedules
7. SM4 Configurator Software
8. SM4BAT Utilities

MINI BAT 2 - In Stock

Available in two models - AA version or li-ion version


Charger for 18650 Li-ion batteries
(charges up to 8 cells)
Song Meter Mini acoustic microphone

Acoustic Mic Stub

The acoustic microphone stub can be added to the MiniBAT 1 or MiniBAT 2 to allow recording of birds, frogs and other ambient sounds when the device is not recording bats using the buit-in ultrasonic microphone.

Easily fitted, this microphone stub can also be used on the Mini Acoustic to give two-channel recordings.

Priced at £95, this microphone gives useful additional capability to the MiniBAT, which is already great value for money.

Security Bracket for Mini Bat 1 & Mini 1 (below)

The steel bracket secures the lid to your recorder and works with any padlock that is 1/4" (7mm) or smaller. Its size can be adjusted to fit a Mini or Mini Bat unit with or without the lithium battery lid.
Song Meter Mini Bat Security Bracket

Song Meter Mini 2 Acoustic Recorder


Recording Format: 16-bit PCM .wav files

Channels: 1 built-in (2 with optional second microphone)

Sample Rates
The recorder supports the following sample rates in samples per second on one or two channels: 8000, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 96000

Built-in Microphone
Directional Characteristic: Omni-Directional
Sensitivity: +6dB ±4dB (0 dB = 1Pa@1kHz Full-Scale) (measured with Mini at default 18dB gain setting)
Signal to Noise Ratio: 78 dB Typ. at 1kHz (1 Pa, A weighted network)
Max Input Sound Level: 101 dB SPL Typ.

Power Options:
4 or 8 AA Alkaline/rechargeable NiMH batteries (AA model)
1-6 18650 li-ion rechargeable batteries (Li-ion model)

8 AA Alkaline: 420 hours (typical at 24kHz mono)
4 AA Alkaline: 210 hours (typical at 24kHz mono)
6 Lithium-Ion Batteries: 1040 hours (typical at 24kHz mono)
1-5 Lithium-Ion Batteries: 173 hours per battery (typical at 24kHz mono)

Storage: 1 SDHC/SDXC flash card slots (Class 4 or greater)
*Supports up to 1TB SDXC cards (will support 2TB SDXC if/when available)
*We recommend using SanDisk SDHC/SDXC cards. You can buy them from our store.

Dimensions: Height: 4.7" / 120 mm; Width: 7.0" / 177 mm; Depth: 1.6" / 40 mm

Without batteries: 0.54 lb / 245g (AA model)
With 8 AA batteries: 0.95 lb / 429g (AA model)
Without batteries: 0.52 lb / 236g (Li-ion model)
With 6 Li-ion batteries: 1.15 lb / 522g (Li-ion model)

Enclosure Material: IP67-rated Polycarbonate Housing

Enclosure Environmental Protection: Fully weatherproof with integrated humidity controls

Operating Temperature: -4°F to +185°F or -20°C to 85°C

Warranty: 2 years recorder (3 years when bought from us)/1.5 years built-in microphone

Song Meter Mini 2 Acoustic Recorder

Redesigned Hinged, Lockable Enclosure
Gain (and prevent unauthorized) access to your recorders via a redesigned, hinged, lockable enclosure. Free up hands to focus on deployment thanks to improved ergonomics, and maintain peace of mind knowing your data is secure.

2X Battery Life (AA model)
Get up to 420 hours' deployment (double that of its predecessor) with just eight AA alkaline or NiMH rechargeable batteries. Choose whether to deploy with four or eight batteries.

Lithium-ion Battery Life (Li-ion model)
Deploy with one to six 18650 Lithium-ion batteries for up to 1,040 hours of recording time (separate lid accessory no longer needed)—an ideal solution for remote or otherwise difficult-to-access sites.

IP67 Weatherproof Housing
Deploy with confidence, thanks to enhanced, IP67-rated weatherproof housing that’s built to withstand even the most rugged terrestrial deployments and harsh elements.

Added Tripod Mount
Quickly deploy in a variety of habitats/landscapes/environments via the newly added tripod mount. Use off-the-shelf equipment for a more flexible setup.

  • Record birds, amphibians and other wildlife that vocalise in the acoustic range
  • A built-in, low noise, microphone produces high quality sound files
  • An optional second acoustic mic stub accessory enables stereo recording
  • A new battery tray comfortably accommodates a wider range of 18650 battery lengths (Li-ion model)
  • ​Compact and lightweight for enhanced portability (0.95lb/429g with batteries - AA model) (1.15lb/522g with batteries - Li-ion model)
  • ​Bluetooth® enabled & programmable via a companion app for iOS® and Android™
  • ​Set GPS location and schedule to record at specific intervals
  • Two-year warranty (3 years when bought from us) (recorder); 1.5-year warranty (built-in microphone)

The Configurator App will work with most smartphones or tablets that run either iOS 12 or Android 8.0 or later. The one major exception we've found is Android devices produced by Huawei, which do not use the same Bluetooth implementation as other Android manufacturers.

Mini 2 Acoustic AA

Now Available

Mini 2 AA only
Mini 2 AA only
Mini 2 AA 128GB
Mini 2 AA
SanDisk 128GB SD card
Mini 2 AA 128GB + batts
Mini 2 AA
SanDisk 128GB SD card
8x Energizer Lithium batteries

Mini 2 Acoustic Li-ion

Now Available

Mini 2 Li-ion only
Mini 2 Li-ion only
Mini 2 Li-ion 128GB
Mini 2 Li-ion
SanDisk 128GB SD card
Mini 2 Li-ion 128GB + 6x 18650
Mini 2 Li-ion
SanDisk 128GB SD card
6x 18650 batteries
Mini 2 Li-ion Charger Bundle
Mini 2 Li-ion
SanDisk 128GB SD card
6x 18650 batteries
8-slot 18650 battery charger
Song Meter Mini acoustic microphone

Acoustic Mic Stub

The acoustic microphone stub can also be used on the Mini Acoustic to give two-channel recordings.

Priced at £95, this microphone gives useful additional capability to the Mini Acoustic, which is already great value for money.

This is the video for the Mini Bat, but it shows how to install the microphone in the Mini.
Does not include analysis software! Check out Kaleidoscope software
Select the type of bat/bird detector you're looking for below
Passive Bat Detectors

Recorders to be left out on site and producing full spectrum files.

Active Bat Detectors

Hand-held recorders that can record full spectrum files and most of them log GPS co-ordinates.

Acoustic Recorders

Hand-held recorders that can record birds, frogs and other audible species. Some also record bats.

Comment from a client:

"My bat detector microphone failed during a dawn survey and knew that I had a group of dusk surveys starting in two days time. I was not in a good place as I did not have a spare, but my equipment was less than a year old.

After my survey I contacted Martin by email and he called me back on the same day, a few hours later, after a quick nap. He told me he did not have a part in stock, but had already contacted the supplier on my behalf.

The next day I received a replacement part, free of charge and express delivered from Switzerland. I thought it was amazing, and could not believe it was resolved so quickly.

Due to Martin's exceptional service I was good to go with the surveys, and I really would like to thank Martin and Wildlife Countryside Services for making the dusk surveys happen." 

David Kent

© 2015 Bat Detectors UK, part of Wildlife & Countryside Services