The A8R rechargeable penlight is only 0.370 in. (9.40 mm) in diameter and fits comfortably in a shirt or coat pocket. The rubberized pocket clip is easily removable and adjustable but stays firmly in place. It casts a nearly perfect circle of smooth and consistent light, making it a great penlight for all types of professional users. Extremely easy to charge, simply slip the Pro Flex Charging Cap over the head of the light and connect to an AC, DC or USB power source. Its aluminum body is both durable and attractive, but most importantly, it's easy to clean up after a hard day's work. Backed by Coast's lifetime warranty against defects in materials and workmanship. Tested and rated to ANSI/FL1 standards by an independent laboratory.