XVive U4 Wireless System Receiver, Replacement Reciever, For XVive U4 Wireless In-Ear Monitor System, Integrated, rechargeable lithium-ion battery, Switchable channels: 6, Frequency range: 20 - 20000 Hz, 2.4 GHz ISM worldwide applicable frequency band, Up to 5 hours battery life on a full charge, Power switch, XLR input, Robust ABS / metal housing@+*Note:* Register your product at www.w-distribution.de/Warranty and extend your warranty to 4 years.@+@+