Samson AirLine Micro wireless earset system features the latest in lithium ion battery technology and small, high-quality audio and RF components. Samson Airline Micro is fully rechargeable, supplying rechargeable batteries and USB DC power inputs for both the AH2 earset transmitter and AR2 receiver. Airline Micro also features a handy docking station for the receiver that also provides a USB DC input and a 3.5mm balanced audio output.