Instruct: Classify the given Amazon review as either positive or negative.
Query: Very good at what it does

I have looked for a passive glowing collar for my cat and this was one of the few I have found! It works fair outside and very good inside. It glows for 20 - 30 min. after being exposed to light and is very reflective. It seems to increase the viability of my cat to oncoming drivers, and it makes locating my cat much easier.