This energy display slider came about when an occupational therapist friend asked me to design one. It's function is to allow children and adults with Chronic Fatigue / Long covid / ME to be able to adequately display how much energy they have available. The slider is simple to operate, requires minimal effort to slide and maintains its position wether standing or laying down. The top pressed on with a snug fit, no need for glue. Big enough to hold and use comfortably by adults and children.