Hello Alex, The units have been retrieved and here are the test results so far. There seems to be issues with consistent high levels of white noise. Audio Moth Testing – White Noise challenge Units AM 1 using a 128 GB U3 ONN card AM2 using a 128 GB U3 San Disc card R: Recording F: Filtering A: Advance Common to both units throughout testing R: Sleep 5 seconds; Recording Duration 3595 seconds A: Daily folder enabled Play back of recordings on a HP Pavilion laptop with B&O speakers at 100% (Max Volume), otherwise as from factory, the settings. Facing the same direction, side by each Test 1 Both units flashed with 1.8.1 update Both sd cards reformatted to FAT 32X Schedule: 0000-2400 hrs Factory default: R: Sample Rate – 48 R: Gain – Medium AM1: A: 48 Hz DC blocking filter – Disabled F: Trigger Type None; Filter Type – None AM2: F: Trigger Type – Amplitude; Filter Type – None; Min Trigger duration 0.001 A: 48 Hz DC – Enabled RESULTS: White noise present both units AM1: White Noise less intense Suspect that the trigger type has no influence on the occurrence of white noise. Test 2 AM1: R: Sample Rate - 8; Gain – Low F: Trigger Type – None A: 48 Hz DC – Disabled AM2: R: Sample Rate – 8; Gain – High F: Trigger Type – None A: 48 Hz DC – Disabled RESULTS: White noise present AM2: White noise slightly more intense Test 3 AM1: R: Sample Rate – 48; Gain – Low AM2: R: Sample Rate – 384; Gain – Low RESULTS: White noise present Test 4 AM1 & AM2: R: Sample Rate –8; Gain – Low A: 48 Hz DC – Enabled RESULTS: White noise present, intensity very low, doesn’t seem to pick up sound unless really close to the units, for example the impact of rain. Test 5 AM1: R: Sample Rate – 8; Gain – Low A: 48 Hz DC – Disabled; Enable Low Gain – Enabled AM2: R: Sample Rate – 8; Gain – Low A: 48 Hz DC – Enabled; Enable Low Gain – Enabled RESULTS: White noise eliminated. Recording of birds chirping really faint. AM 1 play back of chirping more distinct and likely due to microphone orientation being more inline to source. Test 6: Attempt to improve recording clarity and volume of sound AM1: R: Sample Rate – 8; Gain – High A: 48 Hz DC – Disabled; Enable Low Gain – Enabled AM2: R: Sample Rate – 8; Gain – Low A: 48 Hz DC – Disabled; Enable Low Gain – Enabled RESULTS: TBD