The Audio-Technica ATW-T1802 Plug-In Transmitter (Band C 541.500 to 566.375 MHz) is designed for use with the Audio-Technica 1800 Series wireless system. The ATW-T1802 plug-in transmitter feature a locking XLR connector for adapting dynamic and condenser microphones. 12-Volt phantom power is provided for condenser microphones. Selectable Hi/Lo RF output power enhances range when needed and a 2 color power/mute LED indicates transmitter status. The transmitter is powered with 2 AA batteries for up to 9 hours.