A sleek, compact, USB rechargeable penlight with an ultraviolet LED for detection of engine or HVAC leaks, detecting fraudulent documents, or for forensic investigations. Allows you the flexibility of charging on-the-go using the included USB cord or optional AC wall adapter. 400nm ultraviolet LED with 325 mW measured system output; runs 2.5 hours Fully regulated output for consistent UV performance over the battery life Lithium ion battery fully recharges in-product in 2.5 hours; rechargeable up to 300 times Charge indication LED: LED Red Ÿ?? Charging; LED Green Ÿ?? Charged Rechargeable using supplied USB cord or optional AC wall adapter Machined aluminum alloy case. Type II MIL-Spec anodized finish; gasket-sealed glass lens Water-resistant sliding metal sleeve protects USB port; sleeve is purple to differentiate from other models Push button tail switch Ÿ?? momentary or constant on operation IPX4 water resistant; 1 meter impact resistance tested