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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 (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.

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Wildlife Survey & Monitoring  Bat Survey & Monitoring  Bat Detectors  Frequency Division Bat Detectors

Batbox Duet Bat Detector

Manufacturer: Batbox
  • Dual mode bat detector
  • Heterodyne and frequency division
  • High sensitivity electret microphone
  • Carrying case
Batbox Duet Bat Detector
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  • Batbox Duet Bat Detector In stock
Price: £232.50
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Batbox Duet Bat DetectorBatbox Duet Bat Detector

About this product

The Batbox Duet is a dual-mode bat detector which uses both heterodyne and frequency division methods. This makes it an ideal choice for those who want to progress their bat detecting skills and who are looking to listen to bats in the field as well as record the sounds for later analysis.

The heterodyne function offers immediate identification of bats in the field. Just like tuning a radio, you use the dial on the side of the Duet to select the ultrasonic frequency range to listen to. The sound made by the bat is transformed into a sound audible to human ears and can be listened to through the speaker or using headphones (not included).

The frequency division function allows the entire ultrasonic range to be monitored, meaning that no bats will be missed due to the detector being tuned to the wrong frequency. When used with a stereo recorder, the heterodyne output will be recorded in the right channel and the frequency division in the left. This output can then be used with call analysis software, where you will be able to simultaneously listen to the call and view a sonogram of the sound at the same time. Batscan analysis software, also produced by Batbox, has been optimised for use with the Duet. (Please note that, if you are using a mono recorder, only the frequency division output will be recorded).

The Duet is powered by a single 9V alkaline battery (included). A soft carry case and wrist strap are also included.

To connect the Duet to a recorder you will also need a 3.5mm jack to jack cable. For suggestions of recommended recorders, please scroll to the bottom of the page to the accessories list.

Key features:

  • High sensitivity electret microphone
  • Two channel recording output
  • Single-handed operation
  • Audio output via speaker/headphone
  • Low battery indicator
  • Wrist strap
  • Soft carrying case included

Recommended reading:




Type: Heterodyne and frequency division

Quiescent Current: 22mA

Amplifier: 350mW (max)

Size: 12 x 6 x 2.5cm

Weight: 150g

Suitable Recording Formats: digital recorder, minidisc, compact cassette

Power: 9V alkaline battery (included)

Heterodyne Mode

Frequency Range: 17-125 kHz

Bandwidth: >16 kHz

Outputs: Headphone socket and line-out socket (right channel)

Display: LCD

Accuracy: 1 digit

Frequency Division Mode

Division factor: 10

Dynamic Input: Waveform tracking

Type of Microphone: Electret condenser

Outputs: Line-out to left channel only

Frequency Range: 17kHz - 125kHz


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