The REIN features a field serviceable lens and tailcap, electrically-isolated dual-switching for redundancy and a modular three piece design that makes the REIN upgradeable over time. The REIN comes standard with a push-button tail cap, the switch offers both momentary-on and constant-on capability. Includes Rein, Picatinny rail mount, mounting hardware, Defensive labeled Nitecore Charger, Micro USB to USB cord and a Samsung 30Q 18650 battery.