●Size: 3.0 x 1.2 x 0.8 inches (75 x 30 x 20 mm); Weight: Approximately 2.1 oz (60 g). ●Features high intensity LED lamp. ●Built-in lithium battery; Reaches a full charge in 2 hours and can be used for a maximum of 15 hours at a full charge. ●Chargeable via USB and has an automatic power - down feature that activates when it has reached a full charge.This will extend the life of the light. ●Press and hold the power button to turn the light on and off. Press the button normally to switch between the 4 illumination modes: regular beam, regular flashing, strobe flashing and flash.