Double Folding System - Allows you to fold, unfold and store the WalkingPad X21 in 2 steps. No need to mount the handlebar, you can easily unfold the treadmill deck to exercise even in smallest flat. When folded and placed upright, X21 takes up only 0.16㎡ of space with a compact height of 100cm. It also features a lift-lock to prevent the deck falling over.