Constructed of 6061 T6 aerospace aluminum and is coated in satin black hardcoat. O-ring sealed for water resistance and a foam vinyl grip. Uses 2 x CR123 Lithium batteries for 1 hour of runtime, or you can interchange the power cell tubes to use 3 cells for 2 hours runtime or 4 cells for 3 hours runtime. 3 high output Cree LEDs for 240 lumens of output. Overmold tailcap activation switch. 3 position rotary collar, locked, on/off, and intermittent.