This product uses highly integrated chip design, ID code pairing authentication. Adjustable channels: 30 adjustable channels Modulation mode: DQPSK Frequency stability: ±3PPM Frequency response: 40Hz-20KHz Working range: 50-80M Operating voltage: Built-in 3.7V, 500mAh lithium battery, use time 6-8 hours This product uses converters and can be used on devices such as speakers, amplifiers, mixers or guitars. Colour:Black Material:ABS Specification:1 to 1 Package Contents: 1 set of Microphone Dynamic Microphone 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.