Power Output:5W Battery Capacity:1200mAh Speaker Size: 3 inch, 2ohm Play Time: Up to 4Hours DC5V: Charging Jack, you can use the dedicated adapter to charge. TF Card: Insert the TF card to play MP3 Music. Aux: USe the cable with 3.5mm plug to connect the Mic slot. USB: Insert U disk to play MP3 MUSIC.