At 20 lumens, with a metal clip, all metal frame and micro USB charge port, the Sapphire USB is the ideal backup light. Itís significantly sturdier and brighter (10 times brighter) than its popular predecessor in the ASP Everyday Carry light category. A custom designed Lithium polymer battery powers the Sapphire USB, which will run uninterrupted for approximately 90 minutes and can be fully recharged using a Micro USB cell phone charger or the USB port of any computer. The Sapphire USB battery indicator blinks red when it is charging and turns solid green when fully charged. Conveniently attaches to belts, backpacks and purses with a spring loaded metal clip, the Sapphire USB has an ambidextrous top mounted on off switch. The unique design of the switch allows users to push it down for intermittent light or press and slide it forward for a continuous beam. The two motions are designed so the light will not be turned on unintentionally.