Double speakers Multiple functions: this is an enchanted mouthpiece +bluetooth speaker, you can k tune and record a melody then play your tune! Support TF card breakpoint memory playback Easy to work: no need for any driver, you can associate Bluetooth sing without a wire in any time anyplace HIFI sound quality Excellent sound: accomplish genuine low commotion and high fidelity, voice clear, delicate Bluetooth 4.1 connection innovation Support K tune APP:WS858 support android and ios, support all K melody APP.