2.4G wireless audio door phone 1.communication distance: more than 300 meters 2.max combination: 99 pcs 3.high clear voice 2.4GHz wireless audio intercom,supporting 99 pcs intercomElectrical Features1. Using 2.4G ISM public frequency: 2402~2479MHz2. Air transfer rate: 250K 3. Transmitting Power: < 20dBm(<100mw), Receive Sensitivity: <-1004. AFH technology, super anti-jamming capability5. Panel ...