Wireless System UHF band, 24-bit/48kHz, signal range 40 m, operation up to 6 hours, audio frequency range 30 - 15,000 Hz (+/- 3 dB), Rechargeable 400mA lithium battery in both transmitter and receiver, set contains one receiver and one transmitter, suitable e.g. for audio transfer between mixer and speaker, size 100 x 26 x 15 mm, 2x microUSB - USB cable, double USB adapter for socket and plastic case included