UHF 516-585 MHz range, adopt PLL combined technology, 24 Mic. (12 Sets System) can be used simultaneously without interference * AV-JEFES TCM361-35 Condenser Lavalier Microphone (Omnidirectional) * Receiver Power Supply: AC 110V * Transmitter Power supply: 2 AA (not included) * Operating Range: 300 Ft outdoor,180 Ft indoor condition