Features : Large dynamic range for crystal-clear sound quality Advanced noise squelch function to minimize external interference and howling High-quality components and chips for top-notch sound performance Comprehensive solution for common KTV problems, such as mixed frequency and sound-off 2 microphones for professional use at any event Ideal for Karaoke, sound source recording and amplifying, vocal concerts, live performances, conferences, musical and opera performances, church services, schools, halls, family gatherings, and parties Reliable and easy to use, ensuring your event is a success. Specification : Material: Metal, ABS Receiver: Receiver Size: 8.25" x 7.25" x 1.75" Receiving sensitivity: <10dbuv Image suppression:> 80DB De-emphasis: 50us Power supply: AC110-220V 45 / 60HZ Power consumption: 4W Microphone: Transmitter power: 30mv Modulation method: FM, F3F Stray radiation suppression:> 40DB Maximum modulation: ± 75KHZ Power supply: 1.5V Battery power consumption: <30MA