... microphone 3.7 V battery FM radio waistband amplifier Item No.: GS-102High lights:Functions: FM radio, microphone, recording, amplifier ... slot ( USB 2.0)Power supply: rechargeable with high capacity cylindrical L--Battery, keep working with 8 hoursOuput ... working time Keep working in 7-8 hours Function Mp3, FM radio, Amplifier, Line-in, loudspeaker, microphone, reverberationColor ChoiceredWeight400g ( ...