USB FM radio waistband amplifier with reverberation of sound with headset ... W, clear and nice loud voice, good penetration. Technique Data:Output power12WFrequency Response100Hz-20KhzEcho ICPT 2399Amplifier ICTEA 2025Output Impedance4 ΩOperation ... time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, loudspeaker, microphone, reverberationColor ChoiceBlack,Red, BlueWeight 225g ( ...