Xvive Audio U4 Wireless In-Ear Monitor System with One Receiver (2.4 GHz) 2.4 GHz Band Works Anywhere in the World, Works with Any Type of Headphones, Transmitter Plugs into XLR or 1/4" Gear, 5 Hours on Built-In Rechargeable Battery, 24-Bit/48 kb/s, 5...