... ,MP3 input2,FM radio with antenna3,with echo Features:The Rechargeable Voice Amplifier adopts ABS engineering plastic, impact resistance Tone clear ... the input stage "tells" the the output stage how much electricity to release from the amplifier's stores, recreating the sound ... 1 x Power Adaptor With ROHS,CE,ISO 9001 certificate Rechargeable Portable Waist Hanged Voice Amplifier GP977 red