Ultra-portable LED pen light is the same size as a regular pen and stores easily. High-intensity LED lamp lasts up to 100,000 hours. Waterproof, durable machined aluminum case has a non-slip knurled grip. Penlight passes 2-meter drop test. Momentary blink and constant on modes. Handy pocket clip. Battery Type: Alkaline; Flashlights Type: Penlight; Power Source(s): 3 AAAA; Bulb Type: LED.