Modular 3-piece design. With a modular electrical system and remote switch, REIN micro is upgradeable as subsequent generations are released. Strongest-in-class lens. The glass on the REIN is 3mm thick. It can take multiple hits from 5.56mm Simunition rounds, at contact-distance. Patented Battery Jack feature. This allows you to properly tension the battery inside the system to avoid battery bounce. This lengthens the life of your system and increases reliability substantially. Specifications for Cloud Defensive 3.0 High Output REIN Micro Light: Manufacturer: Cloud Defensive Light Output: 1000 lumens Battery Type: 18350 Beam Color: White Length: 4.88 in Weight: 5.41 oz Bezel Diameter: 1.3 in Battery Quantity: 1 Features of Cloud Defensive 3.0 High Output REIN Micro Light 95,000 Candela peak beam intensity 1000 Lumens output 40 minutes run-time  Dual-Fuel capability. 1.3 Bezel diameter smaller than the original REIN in diameter 4.88 in length Reduced mounting lug height Package Contents: Cloud Defensive 3.0 High Output REIN Micro Light 1 REIN 3.0 Micro 1 Remote switch tail cap assembly with integrated push button 2 LCS side plates with hardware 1 Torrent MLOK Inline with all mounting hardware 1 Cloud Defensive labeled Nitecore Charger 1 18350 battery