A compression device is disclosed for applying compression to a body part of a user. The cap is attached to said body by a strap which pivots from said body, said cap being arranged to slide on the strap such that the cap must translate away from the mouthpiece prior to the pivoting of the strap. In pinned-edge image stabilization, the final stabilized output video has the same dimensions as the pre-stabilized input video captured by the image sensor.