4 RECHARGEABLE WIRELESS MICROPHONES ZERFUN Rechargeable Wireless Microphones with independent Volume ECHO Treble BASS Control Perfect for home karaoke meeting party church DJ wedding and much more They are well made cardioid wireless mics which means they pick up noise uni directionally Only when we speak towards the top of the microphone will there be a sound while there will be no sound when speaking on the side With this pickup pattern the directional vocals are easy to isolate from background noise OUTPUT 1 4 Inch 6 35mm Receiver Output designed for Speaker PA Speaker System Power Amplifier or other devices with MIC Input Notice This microphone set is Not For Phone PC Camera TRANSMISSION RANGE The ZERFUN Cordless Microphone can support up to 164 feet range Outdoor The 2 4Ghz frequencies range are compliant with the FCC regulations BATTERY INFO Both microphone and receiver with built in rechargeable battery When full charged microphone working time about 8 10 Hours receiver working time about 4 5 Hours PACKAGE LIST ZERFUN Rechargeable Cordless Mics x 4 Receiver x 1 Charging Cable x 3 Microphone Windscreen x 4 Antiskid Ring x 4 User Manual x 1 Genuine ZERFUN Wireless Microphone products come with supportive 24 Hours After Sales Customer Service 12 Month Manufacturer Assurance