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British Wildlife

8 issues per year 84 pages per issue Subscription only

British Wildlife is the leading natural history magazine in the UK, providing essential reading for both enthusiast and professional naturalists and wildlife conservationists. Published eight times a year, British Wildlife bridges the gap between popular writing and scientific literature through a combination of long-form articles, regular columns and reports, book reviews and letters.

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Conservation Land Management

4 issues per year 44 pages per issue Subscription only

Conservation Land Management (CLM) is a quarterly magazine that is widely regarded as essential reading for all who are involved in land management for nature conservation, across the British Isles. CLM includes long-form articles, events listings, publication reviews, new product information and updates, reports of conferences and letters.

Subscriptions from £22 per year
Wildlife Survey & Monitoring  Ornithology & Bird Ringing  Sound Recording  Headphones, Speakers & other Accessories  Speakers

Pettersson L400 Ultrasound Speaker

Manufacturer: Pettersson
Pettersson L400 Ultrasound Speaker
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  • Pettersson L400 Ultrasound Speaker Not in stock: Usually dispatched within 4 days
Price: £958.33
About this product Specification Customer reviews Related products

About this product

The L400 is an ultrasound loudspeaker with a built-in amplifier that can be connected to any recording device capable of playing ultrasonic signals. The speaker is most effective when used with recording/playback devices which are purposely designed for ultrasound signals, such as bat detectors. However, a computer with a high performance sound card (192 kHz sampling rate) may also be used and most will play sounds of up to 85-90 kHz. (Please note that this will only work if sound files have a sampling rate which is supported by the sound card. If the file is a time-expanded or high-speed recording, re-sampling of the file to match the rate of the sound card will be required in order for it to be played correctly).

The L400 is a great teaching aid giving students the ability to listen to recorded bat calls from the loudspeaker using their bat detectors.

The speaker can also be used effectively as an acoustic lure when detecting in the field.

Please note, however, that a license is always required to use a lure for bats.


  • Ultrasound loudspeaker with integrated 14 W amplifier
  • Frequency range: 10 kHz - 110 kHz
  • Powered from 8 x AA cells (built-in) or 12 - 28 V external power supply
  • Max. output level: > 100 dB @ 1 m (at 28 V supply voltage)
  • Volume control
  • Level indicator
  • Rugged aluminium housing
  • Size: 24 x 16.5 x 7 cm
  • Weight: 1.6 kg, incl. batteries

Customer Reviews

Manufacturer: Pettersson
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