The Samson AirLine Micro Wireless Earset Mic System makes use of a micro sized AH2 transmitter ant AR2 receiver. The AirLine Earset Mic also uses tone squelch and auto mute to keep your audio clear. This system is complete with an AC adapter, charging cables and zippered carrying case. The AirLine Earset Mic transmitter works with a lithium ion rechargeable battery for five to six hours of uninterrupted operation plus uses just one button for controlling the power, the mute or the volume. The AR2 receiver is wireless and performs with a fully charged lithium ion rechargeable battery for seven to eight hours. The AR2 Dock is used during operation and recharging. This utilizes a USB DC input and the transmitter is fully water resistant.