?Professional service and after-sales of goods?Any query, please feel free to contact us at the first time, We will ALWAYS provide you the best customer service, and full refund or replacement for faulty product within 365 days. Note: plz charge the machine or mics with cables for longer when the product is unused for a long time. ?Independent Mic Volume Control? There are own own volume control are builted for each dynamic or lav mic features so that you can balance the vocals as needed for a karaoke experience that everyone will have the best experience of singing and be dig into it. Perfect for PA, karaoke, Dj party. ?Long Lasting Entertainment? We recommended to use 4 rechargeable batteirs, and also the receiver only needs to charge for about 2-3 hours and can be used up to 6 hours. Our mic are using multiple power output terminals on the DC-DC boost conversion module to provide corresponding working voltage for the microphone audio inside the microphone circuit, to achieve the low-power operation of the wireless microphone. ?Easy Set Up?There is no any software download needed, and the frequency has been sat up, its easy as just plug and play, no required pairing. Superior signal stability, compatible with karaoke machine, powered speaker, amplifier, mixer, audio interface. (NOTE: the system is not compatible with phones, computers and tablets.). ?2 Karaoke Microphones ALPOWL UHF wireless microphones have upgraded and use the latest Super high frequency technology to ensure stable signals when singing. ?Two microphones use only noise reduction technology, and professional audio processors can adjust high and low frequencies to ensure sound quality while transmitting your voice more efficiently for a better singing experience.