Olight T20 Q5-2008 Flashlight Uses 2 CR123A batteries Includes One lanyard, two spare O-rings, one tailcap Olight Unique Reflector: Half Smooth & Half Textured for Flawless Beam and Excellent Optic Efficency Memory feature--remembers last setting when turned off and on Three Modes with Eight Levels of Brightness: Illumination Mode (Five Levels), SOS Mode (Two Levels) and Strobe Mode