Spec.: 60CM Cell volt./current: 2.4V/700mA Solar Panel Dimension: Ф103mm LED: super bright LED 3pcs Brightness: 8000—15000MCD Controller: digital programming against over-charge,over-discharge;auto on/off. Work Temperature: -20℃~+60℃ Shell Material: Stainless steel Continuing Work Time: illuming lasts for larger than 8hours after being charged in daytime.