As the Ultimate Edition, the TK15 not only features a light output of 1000 lumens, but also boasts a CREE XP-L HI V3 LED for an impressive range of up to 325 m (manufacturer specification). 4 light levels (1000/350/150/10 lumens) along with the strobe can be conveniently controlled with the side switch. The on-off switch on the light endcap provides constant and momentary light. Includes removable clip and removable tactical ring. Stainless steel front ring. Operable with 2 type CR123 batteries or 1 type 18650 rechargeable battery. Shipped with holster, batteries (2x CR123), spare gasket, and lanyard. Head diameter: 34 mm, body diameter: 25.4 mm.