Microphone - Wireless transmission system Wireless transmission Stable signal Long battery life. Plug and play, Automatic matching at boot - the shackles of wired, plug-and-play, Automatic matching on boot, Simple and easy to use, enjoy wireless fun. Upgraded line active noise reduction - Built-in active noise reduction chip automatic noise reduces at boot. Built-in lithium battery long battery life - continuous use for 8-10 hours. MIC/Music/48V Three modes to switch - Dynamic microphone/audio mode/cond enser microphone High-resolution 24-bit/48kpbs audio transmission. Strong compatibility, supports multi-device connection, and enjoys the fun of wireless transmission. WIRED SHACKLES - Suitable for multiple scenarios, Suitable for concert performances,outdoor playing and singing, Recording studio and other audio occasions. Measured distance is about 50 meters - Built-in dual antennas, stable reception and transmission. Colour:Black Material:Plastic+Metal Package Contents: 2 x Transmitter 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.