Cree Xm-l LED 800 Lumens On High & 100 Hrs Runtime On Firefly Mode 800m+ Beam Distance 4 Different Brightness Modes & Strobe Mode Quick-change Side Switch Unique Digital Circuit Control Technology To Maximize Battery Life & Consistent Light Output Reverse Polarity Protection Circuit Machined From Aircraft Grade Aluminum Tough Durable Type III Anodized Finish Precision O-ring Sealed Design Resists Water Damage Tempered Glass Resists Breakage Or Scratching On Impact double-sided Coating Maximizes Light Output Superior Heat Sink Designed For Quicker & Better Heat Dispersion Built-in Removable Pocket Clip Crenellated Bezel On Both The Head & Tail Cap For Self Defense Advanced Ergonomic Design With Anti-slip Knurling & Matte Style Finish For Firm Grip Stands On Tail Cap To Serve As Lamp Weapon Mountable With Optional Remote Pressure Switch battery: Uses 3* Cr123a 2* 18650 Rechargeable Li-ion Battery Or 4* Cr123a (with Extension Tube) Not Compatible With Rcr123a and 16340 included Accessories: 1 Extension Tube 1 Holster 1 Battery Tube 1 Lanyard 2 Spare O-rings