stereo mini speaker speaker:1x3w battery:1000mA 3.7v Support MP3,FM,PC,earphone,TF USB high speed read card. High sound,high qaulity,super high fidelitySound effects: high-fidelity, sound than the traditional audio clearer, natural, beautiful, life-like.Insert the headphones into 3.5 millimeters of sockets of standard, enjoy hi-fi, high and clear sound quality.