MR.Jiang Adjustable Stylish Safety Dacron Glow Led Dog Pet Tag Flashing Light Up Collar It is also an excellent way to ensure both you and your pet's safety. Material:nylon strap+LED light bar+battery pack controller(batteries included)+buckle. light modes:Continuous on,Slow flashing,Fast flashing,pause or off.(with switch to select). With buckle, easy and convenient to wear and remove. Note: Please make sure to measure your dog for accurate sizing before purchasing to ensure the perfect fit.