This is a communications set, which consists of a bone conduction earphone and a high-performance microphone. You can hear sounds even when wearing earplugs. A-hum M has the following features:
●You can communicate while hearing ambient sounds (environmental sounds) because you do not need to cover your ears.
●You can communicate even when using earplugs for protection under noisy environments.
●There is no need to fit something to the skin like a conventional headset.
●The device can be used on existing headgear because it is easy to attach to or detach from the headgear (sliding type).
●The microphone has a directivity function and can transmit signals even under noisy environments.
●A digital transceiver is supported.

・Model number:GD-AM

Bone conduction speaker (drip-proof)
・Type: Magnetic.
・Impedance: 8Ω.
・Frequency characteristics: 300 to 3,500 Hz.
・Rated input: 0.5W.
・Maximum input: 1.0W.

PTT microphone
・With 360-degree turning clip.
・High-performance microphone 250 (Earphone jack: Diameter 3.5).
・High-performance microphone 230 (Earphone jack: Diameter 2.5).