The Saramonic SR-HM15 is a handheld wireless UHF microphone transmitter features a compact metallic body,an easy-to-read LCD display, a RF power switch and a PLL synthesizer. The broadcast quality microphone will capture crystal clear and rich sound. It has a built-in antenna, a muting function and power lock function. The channel of SRHM15 is synced up with the receiver via infrared.