The Pettersson D240X
A hand-held recorder for recording to separate device
An old favourite and very popular with many bat workers
Call me on 0333 9000 927 for a chat
The Pettersson D240X has my 60 day 100% Satisfaction Guarantee & extra year's warranty

Hi there,

What can I say about the Pettersson D240X?

If you're looking for a hand-held recorder, the D240X is a very good option if you want to record to a separate device. However, you may prefer the Elekon Batlogger M or M2 if you'd rather have integral recording; otherwise if you'd like a real-time sonogram display check out the Anabat Walkabout and the Wildlife Acoustics EM Touch.

All units record bat calls very efficiently, but the main consideration is going to be personal preference.

Personally, I'd choose the Batlogger M or M2 for a nice easy to use bit of kit.

With all of these units (except the EM Touch) you'll also get a free bat calls book worth £35: 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 £35 voucher.

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

Warm Regards,


Your Pettersson D240X comes with my 60 day 100% Satisfaction Guarantee and my exclusive 2 year warranty for £995 including EU delivery and VAT
(EU delivery is included and if you are outside the UK, we can supply without VAT)
For orders to be shipped outside the UK, please email to get prices.

Free Bat Book worth £35

Add Pettersson D240X to Cart

A very popular heterodyne and time expansion detector with backlit, large digit, accurate digital display, showing the tuned frequency in the heterodyne mode. The frequency and volume controls are on the side of the case, making it easy to adjust. Using stereo headphones, the heterodyne signal is heard on the left channel and the time expansion signal on the right channel. When the built-in speaker is used, a switch is used to select the heterodyne or time expansion signal.

A digital recorder can be connected to the D240X to record the time expanded calls for analysis on a PC. If the recorder has a "voice activated" recording mode, a fully automatic bat recording system is obtained, which can be left in the field for unattended recording of bat calls.


Type: Heterodyne and time expansion (x10 or x20); Frequency range: 10 - 120 kHz (minimum); Display accuracy: ± 0.15 kHz (min); Bandwidth: 8 kHz (± 4 kHz), -6 dB; Headphones output: 3.5 mm stereo jack; Recorder output: 3.5 mm stereo jack; Memory size: 1M x 8; Sampling frequency: 307 kHz; Resolution: 8 bit; Storage time: 3.4, 1.7 or 0.1 sec; Trigger modes: manual, level - broadband, level - narrowband; Battery: 1 x 6LF22 (9v); Comment switch: Yes; Size: 119 x 60 x 25 mm; Weight: 170 g incl. battery; Misc: overload indicator, adjustable input gain, replay of signal in memory through heterodyne system; Warranty: 1 year (2 years from me) - microphones 1 year.

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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