We bought the product, and for the first couple of weeks it worked great, then it just stopped working all together unless it was plugged in. When I opened it up the case for the motherboard and battery the case literally cut the charging cable to where it is now inoperable. Our dog is black so we bought it so we can see him in the house when the lights are off so we don't trip over him and hurt him or ourselves. We were careful with charging it, putting it on or taking it off and our dog is getting ready to turn 20 years old so he is not nearly active enough for this to malfunction by use.