... 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 ... keep working in 7-8 hourse Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberation Application:Used ...