Wireless system for U4 in-ear monitor, light and compact, rechargeable transmitter and receiver operating on the 2.4 GHz frequency band, Aux/Line switch, stereo mini jack output, 24-bit/48kHz A/D conversion, digital transmission uncompressed, 6 channels, range up to 27 m (without obstacles), frequency response: 20Hz to 20 kHz, latency less than 5 ms, dynamic range 107 dB, approximately 5 hours of battery life, USB cable included, robust cases in ABS, delivered with male XLR/6.35mm mono jack adapter, with cover, weight: 90g (transmitter) and 118g (receiver).