Adjust microphone with echo/treble/bass/vol system:The wireless karaoke microphone set has echo, treble, bass Volume,Channel control button, you can experience different sound effects according to adjust the buttons of MICand you can change the different channle with channel button(.Support 10 sets at max) Multiple Compatibility with 6.5/3.5mm Plugprofessional wireless microphones come with 6.5mm (1/4") or 3.5mm (1/8") MIC Jack, insert the mic jack, not an aux/line in jack.Compatible with Party speaker, Singing machine, amplifier, PA system, audio interface, truck speaker system, Dome speaker system and more equipment with mic input.(Notice: Not For Phone, PC, Camera) Long Working Timethe UHF rechargeable receiver of wireless microphone set built-in 1200 mAh batteries can offer about 8 hours working time and fully charged in 3 hours. the microphone have a battery box which recommend using 2 aa alkaline batteries.(4 aa batter have included) UHF Wireless Microphone: Th