The K-Tool International Rechargeable UV Pen Light, No. KTIXD6301, is a 1 watt UV, 365-370 nm for leak detection. It has a 350 MAH Li-ion battery, direct micro USB recharge, and a pocket clip. The light has a 50 minute run-time, 45 minute charge time, and a battery charging status indicator. It measures 4" in length.