Specification:
Frequency range: 640-690MHZ
Microphone Type: Condenser
Directivity: Unidirectional
Transmitter working current: about 100MA
Receiver working current: about 80MA
Microphone size: 97*50MM
Charging interface: USB5V/1A
Transmitter lithium battery: 3.7V/800MA
Receiver lithium battery: 3.7V/700MA