FM radio waistband amplifier with usb, tf card slot to read FM radio, MP3 player,Amplifier, microphone 3.7 V battery FM radio waistband amplifier Item No.: GS-102High lights:Functions: FM radio, microphone, recording, amplifier Supporting TF Card and USB for music ( mp3 format )With USB slot ( USB 2.0)Power supply: rechargeable with high capacity cylindrical L--Battery, keep working with 8 ...