The Streamlight TLR-1S Weaping Light Strobe Model has an ambidextrous momentary/ steady On-Off switch. It securly fits onto a broad range of weapons. It includes keys for Glock-style, Picatinny, Bertta 90 two, S and W 99 and S and W TSW rails.

Note: This model is Streamlight TLR-1s 300-Lumens Tactical Weapon Light, Strobe model with Earless Screw Kit, includes Rail Locating Keys for use with Glock® style, 1913 Picatinny, S&W 99/TSW, and Beretta® 90two; Lithium batteries

• Material/Lens 6000 Series machined aircraft aluminum with black anodized finish.High temperature, shock mounted, impact resistant Boro Float glass lens
• Dimensions
• Length: 3.39 in. (8.61 cm)
• Width: 1.47 in. (3.73 cm)
• Height: 1.44 in. (3.65 cm)
• Weight: 4.18 oz (118.6 grams) with batteries (included in purchase).
• Light Source: C4® LED technology, impervious to shock with a 50,000 hour lifetime
• Output/Run Time:
• 12,000 candela peak beam intensity; 300 lumens. Runs 2.5 hours
• Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination;
• Solid-state current regulation for consistent illumination level
• Switch: Ambidextrous momentary/steady On-Off switch. Double tap of momentary paddle within 0.4 seconds activates strobe. (TLR-1s only)
• Battery: Two (2) 3 Volt CR123A lithium batteries
• Features 
• Ambidextrous momentary/steady On-Off switch 
• One handed snap-on/tighten interface keeps hands away from muzzle when attaching/detaching 
• Securely fits a broad range of weapons 
• Mounts directly to handguns with Glock-style rails and to all MIL-STD-1913 (Picatinny) rails 
• Includes keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW 
• Extensively live-fire tested impact resistant construction 
• Operating temperature: -40°F to 120°F 
• IPX7 rated design; waterproof to 1 meter for 30 minutes
• Approvals: Most models meet applicable European Community Directives
• Warranty: Streamlight warrants this product to be free of defects for a lifetime of use except for batteries and bulbs, abuse and normal wear. We will repair, replace or refund the purchase price of this product should we determine it to be defective. This limited lifetime warranty also excludes rechargeable batteries, chargers, switches and electronics which have a 2 year warranty with proof of purchase. THIS IS THE ONLY WARRANTY, EXPRESSED OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. INCIDENTAL, CONSEQUENTIAL OR SPECIAL DAMAGES ARE EXPRESSLY DISCLAIMED EXCEPT WHERE SUCH LIMITATION IS PROHIBITED BY LAW. You may have other specific legal rights which vary by jurisdiction.