Description:It is also an excellent way to ensure the safety of you and your pet.Features:Material: nylon strapColor: blue, red, orange, yellow, green, pink.LED Battery life: 60 hours.3 light modes: continuous on, slow flashing, fast flashing (with switch to select).Note: Be sure to measure your dog for a precise size before buying to ensure the perfect fit.The actual color of the item may vary slightly from the images due to the light and the different monitors.The size is manual measurement, there may be an error of 2 to 3 cm. Please understandSIZE CHARTSMALL: 32-40 cm MEDIUM: 38-50 cmLARGE: 43-60 cm EXTRA LARGE: 60 -70 cm