[Size] 6.8 * 6.8 * 8.7[weight] 350 g[ Battery ] External Battery[ Power] RMS 3W THD = 10% mono[ SNR ] 80dB[ Speaker ] 1.77 inches ( foreign economic 45MM) magnetically shielded ， 4 ohm[ LINE In Interface ] need the original USB data cable ( standard sound good )[ ] 5V500MA power input AC power adapter ( purchased separately )Each function operating instructions :For TF card U disk player :The TF card into the slot ( make sure to have your favorite music )Blue flashing LED indicates the state of playStill blue LED indicates pauseOff Volume memory functionMusic memory function shutdown? LINE Play ( step phone and computer connections ) :Speaker boot， wife of the speaker audio cable ( ie one is 3.5MM plug ， the other end is a small USB plug ) After removing the 3.5MM plug into the phone ( or computer ) headphone hole ， and then a small DC5V USB plug into the speaker jack ， ( make sure to have your favorite music ) press the MODE button to convert audio function ， speaker AUX function appears on the display ， it can be played .Usage during Precautions1， the voltage must be between 5V-6V using computer USB 5V or power adapter 5V ( optional ) ， use more than 6V adapter power supply will be cut into the overvoltage condition.2 ， If the power converter is self-made ， be sure to pay attention to the current 500 mA or more， because the speaker power use while charging ， it needs a lot of current ， the current shortage of converter easy to burn out or short circuit.