The Modlite Systems ModButton Lite was created out of a need to conserve rail space on a fighting rifle. The ModButton Lite is the smaller version that utilizes all the same technology as the regular ModButton. The only difference is that it is smaller and is not offset, so the button sits directly on top of the rail. It is still a momentary only rifle lighting switch that can deliver enough power for modern weapon lights to achieve their full potential. Older models of switch don't allow Modlite light heads to operate at full power. ModButton fixes this issue with a new plug design and upgraded electronics. This means that your state-of-the-art weapon mounted light can deliver its full power. Thanks to Modlite's partnership with Unity Tactical, the ModButton was engineered to be backwards compatible with all Surefire, Arisaka, and Modlite Scout bodies. It's also compatible with Surefire UE and DS00 tail caps. ModButton is designed for momentary illumination only, however you prefer a switch that's capable of constant on, ModButton can be adapted to that need.