BFY Adjustable Nylon LED Lights Flashing Pet Cat Dog Puppy Collar for Small Dogs Easy to use: simply pushing the control button makes the light ON/FLASH/OFF All batteries in each set are replaceable, and you can choose from two flashing speeds and one steady light speed battery can be replaced and 2 pcs CR2032 button batteries are needed Helps to keep you and your dog & other pets safe during walking or while it's out alone at night Pls note: Colors shown in pictures may slightly differ from actual product due to lighting and color settings