This Fenix PD25 Black personal LED flashlight features five output modes including strobe. Cree XP-L LED. Tactical tail switch with momentary-on function. Side switch for output selection. Uses one 16340 or one CR123A battery. Size is 3.7" long with diameter of 0.8" Weight is 1.7oz (without battery) ANSI/NEMA FL 1 Standard: --Turbo: 400 lumens with CR123A or 550 lumens with 16340 battery. --High: 150 lumens with either battery type. --Mid: 50 lumens with either battery type. --Low: 5 lumens with either battery type. Strobe mimics Turbo.