Wireless Microphone

Transmission frequency band: 2.4GHz Effective working distance: 20m (in open space) Pairing type: Automatic Battery capacity: 72mAh, standard USB 5V charging via Type-C interface Battery life: about 6 hours Charging time: about 1 hour Receiver size: approx. 4.5*2.9*0.6cm/1.77*1.14*0.23in Receiver weight: 3.5g/0.12oz Transmitter size: approx. 6.5*2.5*1.6cm/2.56*0.98*0.63in Transmitter weight: 7g/0.24oz Package size: 12.2*8.3*3.3cm/4.80*3.26*1.30in Package weight: 73g/2.57oz