Tremors are uncontrollable shaking of the hands.  They can be mild to severe and limiting to varying degrees based on their intensity.

A man who has tremors may not have difficulty placing the urinal and the tremors are usually controlled once the arm is stabilized against the body.  The problem is when they move the urinal away from the body and attempt to set the urinal on a bedside table or hang it on the bed railing  (or attempt to use the urinal with urine already in it). 

The tremors cause the urine to spill frequently.

The MUDS solves this problem because the urine doesn’t stay in the receptacle, it drains into the container making it a Male urination problems