... 7 V battery FM radio waistband amplifier Item No.: GS-102High lights:Functions: FM radio, microphone, recording, amplifier Supporting ... alloy material, professional and fashion appearanceAdditional Recording function Technique Data: Output power15WFrequency Response180Hz-18KhzEcho ... time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, Line-in, loudspeaker, microphone, reverberationColor ...