Dog Safety Collar Flashing LED Adjustable 2.5cm Width (Blue, S) LED light glows and flashes in darkness. Helps to keep you and your dog & other pets safe during walking. Also work as a decoration: let your dog more attractive. Easy to use: simply pushing the control button makes the light ON/FLASH/OFF. 2 * CR2016 button batteries (pre-installed) Pet Bust Size:S: 35-43cm Width: 2.5cm