1.Inside there is a high capacity rechargeable lead-acid (800mAH) free maintain. 2.Alternating Current: 220V/HZ, keep the charging 12 hours. And most charge time should be less than 15 hours. 3Output voltage: DC4V. 4.Durable recharge period more than 500 times. 5.Using special condensing reflecting cups, the range can reach 250 meters. 6.When the battery is fully charged, the lamp can be lighted continuously about 25 hours. 7.Super strong light source, please don?t shine the eyes directly.