Professional audio processor and tuning system, three layers of noise reduction, create an echo.Karaoke singing microphone has a built-in 1000mAh rechargeable battery to provide 3-4 hours of continuous use, and a quick re-charge time.You just need to connect the microphone with your phone via Bluetooth, and then open any singing APP on your phone and start your show Fully compatible with Android and iPhone with an SD card slot for recording your performances.Whether you are practicing your singing alone, spending time with your family or having a party, this Bluetooth microphone is a must-have tool. It provides hours of simple fun for all the family, an ideal gift for the Christmas & New Year get togethers for budding singers young and old, try it our and see if you can really sing4 in 1 portable wireless microphones can be used as a standard microphone, a Bluetooth speaker, a music player and a recorder. it's great for practicing your singing, playing music, listening to songs & recording your singing voice. It's fit for children, teens & adults.Specifications:Item Type: MicrophoneMaterial: Aluminum AlloyColor: Black/Rose Red/Rose Gold/Gold/BluePickup: CapacitorOutput Wattage: 5W * 2Frequency Response Range: 100Hz ~ 10KHzMaxiumum Sound Pressure Level >115dB 1KHz THD