Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Problem Cuff

I attempted to use this item several times on myself and my dad with poor results. The cuff length is adjustable via a loosely fitting metal bar. When the cuff is inflated on the arm, the bar allows the cuff lenght to expand and/or the velcro closure does not hold. Result is an unacceptable number of repeat attempts and unrelaible readings. I returned it to Amazon.