EXMAX wireless audio transmission system could transmit voice of who speaking to microphone of transmitter to the ones wearing earphone of receivers,transmission distance is about 100 meters (328ft).99 frequency channels on 195MHz means it has 99 selected IDs allowing at least 40 groups to work simultaneously.Widely used for field trip,tour guides,exhibition live explanation, sermon interpretation,silent conferences,church translation,audio visual laboratory,events for church,hajj.. Transmitter weighs 133g and receiver weighs 49g,Small and light for carry or carriage. High S/N Ratio(0dB) ensures clear voice transmission. Transmitter features a 4200mAh rechargeable lithium battery, offering up to 20 hours of use, while Receivers 1200mAh battery lasts up to 25 hours. One transmitter could pair up countless receivers so long as on the same frequency channel.Transmitter has 3.5mm input jack, it supports AUX( such as MP3, Smartphone,MP4,CD ) and MIC input. The wire of microphone and