Fenix AER-TK75 Extender Tube for FENIX TK75 LED Flashlight with Battery Magazine, Four Genuine Fenix ARB-L2 18650 Batteries, Nitecore i4 smart battery Charger and Red Smith & Wesson LED CaraBeamer Clip Light Package Fenix Model AER-TK75 Extended Runtime kit Comes with battery magazine to accomodate four 18650 batteries Genuine Smith & Wesson Red LED CaraBeamer Clip Light Included