1. Inside there is a high capacity rechargeable lead-acid free maintain battery 2. Alternating current: 110V-220V/50Hz-60Hz, keep charging 12 hours but no more than 15 hours;
3. Output voltage: DC 4V;
4. Durable rechargeable period: around 300 times
5. When the battery is fully charged. The lamp can be lighted continuously about 8-10 hours; 6. Please charge every two month when no use.