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HydroMoth (Round 3)

Last Chance Buy: Underwater Recording Kit
HydroMoth (Round 3)
HydroMoth (Round 3)
HydroMoth (Round 3)
HydroMoth (Round 3)
0 of 4
HydroMoth (Round 3) HydroMoth (Round 3) HydroMoth (Round 3) HydroMoth (Round 3)
222% Funded
222 of 100
0 of 222 units are still available
$135.00 + Shipping
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Product Details


HydroMoth (Round 3)

Brand / Manufacturer

Open Acoustic Devices

Manufacturer Part #


Product Description

HydroMoth is the latest product from the AudioMoth range and offers everything needed to start recording underwater sound for extended periods of time at depths of 30-60m. HydroMoth hardware is directly compatible with all AudioMoth firmware, meaning you can use the device in any number of underwater applications, from scheduled recording in coral reefs, to triggering recordings by amplitude or frequency in freshwater ponds. HydroMoth has improved LED visibility and more accurate time keeping for long deployments. It also has an in-built magnetic reed switch, which enables recordings to be started and stopped in wet conditions without opening the case. HydroMoth is sold with the AudioMoth Underwater Case as standard, with the option to add a waterproof magnetic key chain fob to make use of the magnetic reed switch.

Included in kit 

HydroMoth 1.0.0
AudioMoth Underwater Case


EFM32 Gecko processor
Capable of recording uncompressed audio to micro SD from 8k to 384k samples/second
Records uncompressed WAV files to SD card
Powered by 3 x AA batteries
Analog MEMS microphone acts as contact hydrophone
Analog pre-amplifier with adjustable gain
Configurable USB interface
Onboard real-time clock keeps track of time in UTC
Improved 32.768 kHz MEMS oscillator to reduce clock drift
Tested to a depth of 30m for 2 months

Boat noise monitoring
Freshwater sound surveys
Coral reef soundscape monitoring
Cetacean underwater acoustic studies

How Other Scientists, Ecologists, (& Basically Cool People) Have Used the HydroMoth:

Hand holding a hydromoth device in front of a freshwater pond.

@RobinSandfort: 20 minutes from post box to pond. Our first dedicated #hydromoth arrived. Can‘t wait for some underwater #bioacoustics. Show us your freshwater hydromoth sites! #capreolus


@and1hill: Very exciting! My first #HydroMoth recording of dolphins off the coast of Exmouth. Recorded at 250kHz and downsampled to 32kHz to improve SNR ⁦@OpenAcoustics


@900hz: #HydroMoth listening and an Egret looking in this tidal pool full of life




Purchase Information

Unit Deliverable

One HydroMoth, One Underwater Case

Unit Price



Campaign Funded, ends when minimum unit count reached

Lead Time

3 Days

Options and Add-Ons

Magnetic fob keychain


This magnetic fob keychain can be used to trigger the in-built magnetic reed switch on the HydroMoth, which enables recordings to be started and stopped in wet conditions without opening the case.

Disclaimer: Magnetic fob keychain may come in the color red, yellow, or orange.

SanDisk Extreme® microSDHC™ UHS-I w/adapter- 64GB


This have been validated by Open Acoustic Devices to deliver the highest quality recordings and best compatibility with HydroMoth 1.0.0.

AudioMoth Case Green


The official AudioMoth IPX7 waterproof case from Open Acoustic Devices is designed specifically for AudioMoth version 1.0.0 to 1.2.0. It is effectively sealed using an easy-to-use clasp with compression o-ring. The acoustic path is protected from water-pooling with a neatly designed rain-hood and the microphone opening is waterproofed using a Porelle acoustic vent. 



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