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 Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Black Material:Plastic Package Contents: 1 * Transmitter 1 * Receiver 1 * Earphone 1 * Charger Cable