1、Specifications: one for two 2、Wireless frequency range: 2400-2483MHz 3、Audio Frequency Response: 30Hz-20KHz 4、Microphone Type: Condenser 5、Audio delay: <20ms 6、Use distance: 100 meters (open environment) 7、Microphone charging time: <1.5 hours 8、Built-in battery: high-capacity lithium battery 9、Microphone battery life: 6-8 hours 10、Charging time of charging box: 2 hours 11、Charging bin battery life: 2 cycles 12、Signal-to-noise ratio: 56dB 13、Functional use: Outdoor interviews, video shooting, webcasting