Best Dual UHF Wireless Microphone with Volume Control + ECHO Function. No Need To Set, Just Plug and Use! Perfect for Karaoke, Speech, Meeting, Performance, Indoor or Outdoor. | No need to buy batteries! Rechargeable UHF Dual Wireless Microphone With Receiver System. Both microphones & receiver can be rechargeable. Each Microphone with 2200mAh 18650 rechargeable battery; Receiver with Built-in rechargeable Lithium battery. When full charged, microphone working time about 10 Hours, receiver working time about 5 Hours; Dual USB Charging Port for Charging. | 1/4 Inch(6.35mm) Receiver Input designed for Outdoor Karaoke Speaker, PA Speaker System, Power Amplifier, etc(Notice: Not For Phone, PC, Camera). Microphone & Receiver use UHF Connection Technology; Working Range about 100ft(30m); Frequency Response 50Hz-18kHz; SNR >70dB; Distortion <0.5%; Latency <3ms; 10 UHF Work channels(CH01-CH10). | Support 10 sets at max for Simultaneously Using(Each Set Using In Different Channel). Notice: If Microphone & Receiver can’t connect with each other, they need Pairing to Reset, please see how to Pair/Reset in User Manual. | Best Customer Service, 30-Days money back service and 12-Month free replacement. If you have any problem about our microphone, please must contact with us. Click Sold by "Kithouse Direct", then leave a message to us. Your problems and suggestions is the key for us to improve. Thank you for choosing Kithouse products!