Smallest size, easiest to control headset. 2.4G wireless technology, low latency, no compression; Support connecting to mobile phone for feedback stereo, plug and play. Suitable for wireless monitoring system for stage performers and performers, providing higher quality sound feedback. Sampling rate: 24bit/48KHz lossless digital transmission Wireless frequency range: 2.4GHz Delay: less than equal 12ms Effective distance: less than equal 30 meters outdoor distance or 15 meters wall distance Power supply: Built-in lithium battery can be by USB in 10 hours Charging device: USB charging cable supports fast charging Signal-to-noise ratio: -98db Dynamic Range: 105dB Frequency Response: 20-20K Hz, +1db/-3db Colour:Black Material:Plastic Package Contents: 1x transmitter 1x receiver 1x USB cable 1x 6.35 audio converter 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.