... connection -Removeable lithium battey Stainless steel headband 2.4G Digital Wireless Headset 2.4 G wireless SNR original sound transmission, ... code-free plug and play intelligent connection When USB NANO transmitter connect to the USB port of PC/ Laptop , ... Φ2cmReception range and distance : 10M, 360 °Interface: USB 2.0 Package Contents :Wireless headset, USB transmitter,Charging cable, User’s guide