This product is a pre-built underwater LED light module that either supplements the internal lights on your OpenROV, or serves as primary external lighting on any ROV. They are very bright (each of these cubes produce 700 lumens of light, 3 times the amount of the internal lights). External lighting significantly increases the quality of video the ROV produces. They help eliminate the glare from internal lights, are more directionally focused, and can be mounted anywhere on your vehicle. The OpenROV v2.8 is pre-wired to accept the lights. Prior versions (v2.5, v2.6, and v2.7) can be modified to work with them [see documentation] and they can also be easily incorporated into any underwater project with a wide input voltage range and small size.