ModButton Lite is a smaller lighter weight cousin to the original ModButton. The switch features the same momentary only activation as the original ModButton. It also features the same high power cable and switch from ModButton but in a slightly smaller package without the integrated mount. The switch is made from injection molded plastic and fully potted to provide extra degree of protection in harsh environments and ensures a durable long lasting switch. ModButton Lite utilizes a patented Unity Tactical design which supports power delivery needed by the next generation of high output weapon lights like Modlite. A Unity built SurefireA(R) compatible cable lead allows ModButton Lite to be backwardly compatible with all SurefireA(R), Arisaka and Modlite Scout bodies as well as Surefire UE and DS00 tail caps. If constant on is a requirement we recommend using a SF DS00 tail cap which can be found here. One problem that exists today is older legacy switches are not able to pass the current needed to run current and future generation lights. These older switch designs do not allow Modlite light heads to run at full power. Typically these switches reduce output by 15-20%. ModButton Lite utilizes an updated plug design as well as improved electronics that allow the ModButton Lite to output at full power so all the lumens and candela can be put to good use. The package includes the switch PIC mounting rails and mounting hardware only no tail cap is supplied. We recommend the Surefire UE or DS00 tailcap which can be found here. Additionally an adapter is also available for MLOK rails here. Note on cable length options: For almost all use cases the 4.5in variant is what you want to buy. Unless you have a special setup the 4.5 in cable is going to be plenty even running a laser. Made in the USA Weight: 1.8oz Dimensions: 1.0 x 3.8 x 5.7 in Mounting Side: Left or Right Color: Black or Tan