813R works as radio / audio receiver.
Paired with 813T (transmmitter).
①/② : Change channel
③/④ : Change volume
Carrier Frequency: UHF 600MHz-900MHz (customized); channel numbers: 18 - 200 channels;
Working time: 20 hours; battery: lithium polymer battery;
Charging method: charging base and USB cable.
Working distance: >150m; machine size: 86.5*48*18mm; weight: 50g;
Accessories: earphone and lanyard.