Features:
* NRR21dB
* Two microphones
* Cut off immediately when sound over 82dB
* 4-5 times sound amplification
* Independent electronic circuit on both cups for better performance
* Soft padded headband
* Low profile design, light weight
* Dual knobs for on/off and volume
* Adjustable plastic headband fits most sizes
* 3.5mm input jack one side to connect walkie-talkie or cell phone
* Powered by 4 x 1.5v AAA batteries (not included)