Frequency band: UHF Microphone power supply mode: built-in lithium battery Signal-to-noise ratio: 70dB Power supply mode of receiving box: built-in lithium battery Distortion:Less than 0.5% Microphone battery life: about 10 hours Working channel: 50x2 Receiving box battery life: about 5 hours Frequency response: 50-18kHz Charging time: 2-3 hours Latency: Less than 3ms Receiving distance: about 30 meters Warm reminder: The mobile phone cannot be used directly. It needs to be connected to speakers, sound cards, etc. before it can be used. .When using a TV to connect, please note that the TV has a microphone input interface to use. Colour:Black Material:Metal Package Contents: 2 x wireless microphone 1 x receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.