high solar energy conversion efficiency: over 15 percent Solar energy board: 5.5/60 mA AC adapter: 5.0 v/500mA Built-in high-capacity rechargeable lithium battery: 1300 mAh. Output voltage: 5.5 V, output current: 300 - 800 mA Mobile phone charging time: about 60 minutes < Varies a little by different models of cell phones> Solar charging time: 10 to 15 hours (Extending the charging time as much as possible will increase battery electricity, for emergency electricity supply) charging time using a computer or AC adapter: 2 to 3 hours. Applicable to mobile phone <typically with five charging switches: for Nokia, Samsung, Motorola, Sony Ericsson, Mini-USB>, Digital Photo Frame, PDA, MP3, MP4. It could also be customized according to customer demands.