Wireless stage headset microphone Recommendation: Shure BLX14/P31 Wireless Headset Microphone System or any other brands that serves the same. System: Simultaneous Channels Up to 12 Frequency Range 542-572 MHz Operating Range 300 ft. Line-of-sight Frequency Response 50Hz-15kHz Microphone: Form Factor Headworn Frequency Response 60Hz-20kHz Cable Length 4.16 ft. Transmitter: Form Factor Bodypack Mute Feature Yes Battery Type 2 x AA Dimensions 4.3″ x 2.51″ x 0.82″ NOTE: Electrical specification should meet Oman's Specs