Streamlight MicroStream Stylus 3 1/2 overall. Black aircraft aluminum construction with pocket clip. High-flux LED with micro optical system. Up to 20 lumen output. Tailcap switch. Uses 1 AAA battery (included). Up to 1 1/2 hours burn time per battery. Keyring. Hang packaged with "Break Away" safety lanyard." 3.5" overall. Clip. Lanyard. Tailcap switch. Keychain. C4 LED with micro optical system. Up to 45 lumen output. Up to 2 hour burn time per battery. Requires (1) AAA battery (included). Aluminum construction. Color: Black. Hang packaged.