The Pro SuctionCup Mini Clamp from Replay XD requires the separately available Camera Clamp specific to the XD series action camera you have and will clamp around the extension arm of the Pro SuctionCup. This way you can add multiple cameras to one suction cup mount or just one camera and a RePower 2200 battery. In addition to the Camera Clamp, you will need a 5/32" hex key wrench to tighten the hex screw the Pro SuctionCup Mini Clamp uses.