... of sound FM Radio ,Headset Microphone ,Remote control 898A Waistband Amplifier Funtion:Peak Power output: 25 WattsFrequency response: 100Hz – ... Removable belt clip, adjustable waist band, user manual. Power output: 25W Charger voltage: 12V 450mA Product weight: 355g ... Mic directivity Single direction Frequency response 100Hz-10KHz±3dB Power supply: Lithium-ion Polymer 7.4V Product dimention: ...