The Smith & Wesson Tactical Penlight is a multi-purpose tool that is just as useful for writing tasks as it is for lighting your way. The penlight features a replaceable G2 ink cartridge, 125 lumen compact light, and pocket clip. Light uses (1) AAA batteries. FeaturesReplaceable Domestic G2 ink cartridge to ensure product longevity125 lumens for a bright, compact lightSolid metal construction for tactical durabilitySelf-defense tip for emergency use