The Air-2 W (white version) is a professional Dual Wireless UHF Multi Channel Microphone Set. It convinces through a Pick Up Cartridge Transducer that has a wide, linear and dynamic frequency response. A Cardioid polar response picks up sound from the user and helps reject feedback during live application. The Handheld microphone body has a tough durable metal construction with minimal handling noise and runs on AA batterys with High and Low Power Radio Frequency transmission modes (Up to 15Hrs, 8 Hrs on high and realistic usage). The receiver communicates with the wireless microphone transmitter that has a flat and wide response for accurate sound reproduction. The product works with PLL ( Phase Locked Loop ) Synthesized technology for a steady signal and superb clarity, is rack mountable and supports Multi-Channel Wireless Syncing (200 different wireless channels). The UHF Frequency range is 722.900-739.000Mhz and the product is FCC Certified.