Review on Kacctyen Rechargeable Waterproof Flashing Necklace by Amy Thomas

According to the description it is adjustable for all sizes but it is not. I trimmed it to fit my chihuahua who has an 8-9 inch neck and when I decided to put it back on it kinked and wouldn't come out. In addition, the plastic connecting part is too large. The button that was supposed to open the collar doesn't work and the only way to open it is to pull out the hose. I will return them and look for a better brand. They also glow and flash and seem very bright. I haven't used them. So I don't know how long the battery will last.