The TCM-550XL Compact Tactical Weapon-Mounted Light uses a super-bright LED rated at 550 lumens working in conjunction with a precision-engineered total internal reflection (TIR) lens to create a bright white beam of light rated at 136 meters. This weapon light features completely ambidextrous and intuitive rear-facing toggle switches on each side of the light to operate the momentary-on and constant-on lighting modes. The housing of the TCM-550XL is constructed from aircraft-grade 6061-T6 Aluminum with a polymer rear housing. Includes four handgun-specific modular rail inserts (pre-configured with C1 insert for Glock pistols), two spare Allen screws, Allen wrench, and one CR123 Lithium battery.Specifications:Xtreme Lumens: YesFlashlight Lumens: 550Beam Distance: 136 mCandela: 4,612Drop Rating: 2 mDust/Water Rating: IP-X7 WaterproofFlashlight Runtime: 2.5 hrsSwitch Function: Momentary or constant-onLength: 2.5 in (60 mm)Width: 1.1 in (30 mm)Depth: 1.2 in (31 mm)Weight: 2.5 oz (70 g)Light Source: LEDBody Color: BlackQuantity of Batteries: 1Power Source: CR123Package Contents: Light, four modular rail inserts, 2 spare Allen screws, Allen wrench, (1) CR123 batteryUS Patent: 9,713,217Warranty: Limited Lifetime