Solar panel: 0.5W; Inside battery: Ni-MH rechargeable battery of 3.6V/1100mAh; Light sources: 4pcs CFL. If this reading lamp is charged one day via sunshine, it can work 2 to 3 hours. If it is fully charged, it can work 10 to 12 hours. Charging time needed: 1. In case of charging by USB/adapter, it will take 2 to 3hoursfor full charge. 2. In case of charging by the built-in batterythrough sunshine, it will take10 standard hours. Work temperature: -10 60°C Product size: 340 x 97 x 88mm Product weight: 170g