Portable 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 ... 8 hourse Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberation Application:Used for Yoga, Gymnastics,Teaching,Promotion Activitives Conference,Acoustic Instruments,Camping and ...