Evaluation of the pupilary reflex. Features include: #355BK penlight, LED lamp for bright, white illumination for true tissue rendering, LED lamp provides 10,000 hour use eliminating the high cost of replacement lamps, durable CNC machined brass housing in a striking black matte finish, positive feel power switch. Convenient pocket clip, complete with 2 “AAA” batteries and an attractive gift box and lifetime warranty on lamp cartridge. Two-year warranty on penlight.