U3T Transmitter for U3 System (No Receiver) This plug-on transmitter features a gain adjustment switch to handle mic or line level signals. The balanced 3-pin XLR female connector attaches directly to a handheld microphone or line level input signal. It offers an operating range of 90 feet and delivers up to 5 hours of operation on a full charge using the integrated Li-ion 3.7V rechargeable battery. It is compatible with the U3 System