The Tektite 4500 XL strobe features a housing machined from a solid bar of aircraft aluminum plus a LEXAN® cap, solid-state circuitry and DUAL 13-Watt LEDs (1300+ Lumens each) lamp module; making this strobe the brightest and most shock resistant of Tektite strobes. The 4500 XL Strobe is double O-ring sealed, IP68M depth rated to { 2500 ft | 770 m }, twist on switch with non-slip grip, black color aluminum body with sturdy attachment point for snap or lanyard, runs 50 hours on a fresh set of three C-cell batteries and can also accept rechargeable Ni-Cad batteries. Visible at the surface for several miles/kilometers at night, the initial flash rate is 120 flashes per minute with fresh alkaline batteries. At { 9.2 in | 23 cm } long and { 2.2 in | 5.6 cm } wide this strobe is too big to fit in most pockets. Includes an adjustable wrist lanyard, and also includes a limited LIFETIME Warranty from TekTite.