Mobile Power Bank Charger USB Output Micro Input LED Light 3&times; 18650 Batteries (White) USB Output: charge mobile phone, MP3, MP4, tablets Micro Input: absorb energy from PC, laptop, wall charger, car charger 4 charging connectors: Apple 30-Pin / Mini / Micro / Nokia DC2.0 4 LED light reminds stock energy, each one light stands for 25% energy. Bright light means full, flashing light means not full, dark means none One illuminate light, press power button 3 seconds continuous