SC18 flashlight is equipped with Luminus SST-40, easily lighting up the path in front of you with significantly improved throw: it delivers a maximum output of 1800lm at a distance of up to 217 meters, producing a particularly soft and balanced beam profile to preserve comfortable vision. Specification 1.X High Power LED 2.Working Voltage: 2.7V - 4.2V 3.Battery Options: 1 X 18650 Li-ion battery 4.Dimension: 101.5mm (length) × 24.7mm (head diameter) 5.Weight: 55g (without battery) 6.Flashlight body: Aerospace grade 6061 grade aluminum alloy 7.LVP: while on, if the battery voltage is lower than 2.7V, it turns off automatically. 8.HVP: while on, if the battery voltage is higher than 4.35V, it turns off automatically.