Overview:1. High solar energy convert efficiency: over than 16%2. Solar energy boards: 5.5V/60m A or 5.5V/70m A3. High capacity built-in polymer batter: 600m Ah/800m Ah 4. Max output voltage: 5.5V5. Max output current: 500m A6. To charge the built-in battery using solar energy: 15-20 hours 7. To charge the built-in battery using computer: about 3-5 hours 8. Charging cell phone by the built-in battery for 1-2 hours, the battery would be exhausted. Cell phone can stand by around 24 hours, or keep talking 60-90 min. (Based on various states of the mobile phone)9. Exposure or USB (Universal Serial Bus) charging time at least 2 hours (First using) Specification: Weight Approx:130.5g Size Approx:13.5 x 9.5 x 4