... CE,ROHS,ISO etc 2,professional amplifier,with USB,TF,MPS input 3,several colors to selection ... : pink ,red,black,white Features:The Rechargeable Voice Amplifier adopts ABS engineering plastic, impact resistance Tone ... to use, can make MP3 player With USB,SD/MMC MP3 input With echo function Audio ... delicate wires that transfer signals to the speakers' voice coils. Details: Four colors to selection Made ...