Equipment  Bat Survey & Monitoring  Frequency Division Bat Detectors 

Batbox Duet Bat Detector

  • Dual mode bat detector
  • Heterodyne and frequency division
  • High sensitivity electret microphone
  • Carrying case


#175132 | Availability: In stock
NHBS Price: £255.00 inc VAT $329 / €293 approx

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:
* Batbox Duet User Manual
* Using Batscan for Sound Analysis (JNCC and BCT guide)




* 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
* Reference Tone: 10.238kHz to left channel



Recommended Accessories

3.5 mm to 3.5 mm Stereo Jack to Jack Cable Lead

Use this cable to connect your Batbox Duet to a hand held recorder

NHBS Price: £2.99 inc VAT $4 / €3 approx

Batbox BatScan Software v 9.8

BatScan software allows you to analyse your bat calls on your PC. This software is optimised for use with the Batbox Duet

NHBS Price: £20.50 inc VAT $26 / €24 approx

Tascam DR-05 Portable Handheld Recorder

The DR-05 is a cost effective choice and allows you to record you calls onto micro-SD card for further analysis

NHBS Price: £86.99 inc VAT £111.60 (Save £24.61) $112 / €100 approx

Power Options

9V Alkaline Battery (6LR61)

A spare/replacement 9V battery for use with your Duet

NHBS Price: £3.50 inc VAT £3.95 (Save £0.45) $5 / €4 approx

Recommended Reading

A Guide to British Bats

Ensure that you get the most out of you bat detector with this handy guide from the FSC

NHBS Price: £2.99 $4 / €3 approx

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