Review on Premium Waterproof Dog Collar for Medium and Large Dogs - USB Rechargeable and Adjustable Flashing Light Collar with 8 Hours of Battery Life by Michelle Larson

The collar works well, the LEDs all light up as they should, the charger and cable in the kit work. My only concern is that the battery is quite bulky. This is technically good as you don't want the battery getting damaged or punctured while your dog is wearing the collar, but it seems like leaving the collar on for a while would make the dog uncomfortable. However, this collar is meant for nighttime walks, so it's not likely to be worn around your dog's neck for long periods of time. If you go for long walks at night then this is just something to consider.