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HydroMoth (Round 6)

Everything needed to start recording underwater sounds
HydroMoth (Round 6)
HydroMoth (Round 6)
HydroMoth (Round 6)
HydroMoth (Round 6)
0 of 4
HydroMoth (Round 6) HydroMoth (Round 6) HydroMoth (Round 6) HydroMoth (Round 6)
35% Funded
175 of 500
1775 of 1950 units are still available
Ending Date: Mon, 08 Jan 2024 11:16:00 PST

Product Details

Brand / Manufacturer

Open Acoustic Devices

Manufacturer Part #


Product Description

HydroMoth 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

Important Notes

  • Orders will be shipping around January 8th 2024, once shipped you will receive an automatic email with your tracking information.
  • Your order may be charged while the GroupGet campaign is live and active.

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

Important Notes

  • Orders will be shipping around January 8th 2024, once shipped you will receive an automatic email with your tracking information.
  • Your order may be charged while the GroupGet campaign is live and active.
  • International Duties and Taxes are not included, you may be required to pay these before delivery.
  • AudioMoth/HydroMoth HTSUS 8519.81.25.00, Country of Origin USA, ECCN EAR99

Purchase Information

Unit Deliverable

One HydroMoth, One Underwater Case

Unit Price



Campaign Active, scheduled end date: Mon, 08 Jan 2024 11:16:00 PST

Lead Time

60 Days after campaign end date

Options and Add-Ons

HydroMoth (Round 6)

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.

HydroMoth (Round 6)

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.

HydroMoth (Round 6)

AudioMoth Terrestrial 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. 


HydroMoth (Round 6)

AudioMoth USB Microphone and Case (Blue)


The AudioMoth USB Microphone and Case (Blue) together make a splashproof and easy-to-use full-spectrum USB microphone. The device streams audible and ultrasonic frequencies via USB and is designed to specifically run using the free AudioMoth Live App and using the AudioMoth USB Microphone firmware. It uses an identical audio front-end to the standard AudioMoth 1.2.0 variants and doesn’t require batteries. It also has a 3.5mm socket to allow additional external electret condenser (PIP) microphones/hydrophones to be used. The case is made from injection-molded polycarbonate and the acoustic path is protected using a splashproof Gore acoustic vent. The case has an easy-accessible switch and a large loop to take strain off of the USB cable or to make it easy to attach to objects during use. 

Latest AudioMoth USB Microphone GroupGets campaign - https://groupgets.com/usbmoth

HydroMoth (Round 6)

USB A to Micro B Charge & Sync Cable


300.0 mm (0.98') Micro USB Cable


Sponsor the great works of our community of developers and conservation technologists who are trying to make a real difference. Contact us at sponsor@groupgets.com for more information about becoming a campaign sponsor. For help or any other questions, please submit a support ticket here.


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