Accessibility & Mobility Aids
Walker Compact Folding Walker, with Wheels for The Seniors Narrow Lightweight Adjustable Height and Detachable Legs for The Disabled
Interaction: Marble is below. One step at a time, the user moves one step forward, mainly for the early stages of rehabilitation. Fixed: marble is on top. The walker can't be twisted, the user can only take one step, and then lift the walker forward...
https://www.bizrate.co.uk/lifestyle_mobilityaids/walker-compact-folding-walker-with-oid40312770677.html