The Lanparte LANC Start / Stop Controller for Blackmagic Cameras allows you to control start and stop functions of optional Blackmagic Cinema, Production Camera 4K, and the Pocket Cinema Camera. The controller clamps to optional Lanparte universal grip, or you can remove the clamp from the controller and mount the controller via a 1/4"-20 threaded mounting hole. The coiled cable stays neat and out of the way until you need to extend the cable.