... speaker USB card waistband amplifier with reverberation of sound FM Radio ,Headset Microphone ,Remote control 898A Waistband Amplifier Funtion: ... Peak Power output: 25 WattsFrequency response: 100Hz – 10KHzAudio play: Aux input, FM radio, mp3 player(TF card,USB ... 7-8 hourse Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberation Application:Used for Yoga ...