- 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 EUR 129.00 - See more - Buy online