2 Receivers and 4 Transmitters for 4 PeopleThe wireless microphone system can be used by four people at the same time.Freely match the headset you want ,of course ,you can also use only one microphone.The working method is to pair four transmitters with two receivers ,and two receivers are connected with a U-shape interface.So your device only needs to have a microphone jack to complete the work of four people. 2.4G Wireless TransmitterAdopted adavanced 2.4G wireless transmission technology.The wireless headset microphone system is easy to pair,just turn on the transmitter and receiver power switchers,the blue light will flash for appoximately 2s,indicator light stops flashing after succesful match ,and then you can use the wireless headset microphone for vouce amplification ,no further action. Rechargeble Microphone and receiverThe microphone and receiver are both built-in 1200mAh rechargeable lithium-ion battery. work time up to 7 plus hours with charging time 3-4 hours.