LUCKSTAR LED Dog Collar - [13-14.2'' / 33-36cm] X-Small Size Glowing Flashing Nylon Pet Collar - 3 Flashing Modes Luminous Safety Collar For Night Walking (Battery-powered) 3 KINDS OF FLASHING MODES: There are three settings for the lights: fast blink, slow blink, and steady. single-click is fast blink, double-click is slow blink, three times click is steady, four clicks is turn off. This collar can make you find your dog quickly, avoid the pet lost, more safe at night (pull out the transparent tab). WATERPROOF LED LIGHT BAR: The collar with LED lights bar possess waterproof function, don't worry it won't work in rain day. If the lights bar is a little long for you, cut it short a little, it also can work. This collar with 2 button batteries, which can be replaced, continuously glow time about 30 hours. Working life is longer! HIGH-QUALITY NYLON RIBBON: This pet collar adopts nylon material, which possess tensile & wear-resistant function, and won't fade and take off the line. It's very durable, good quality. Very Practical! ADJUSTABLE BUCKLE & 4 KINDS LENGTH OF SIZE: This buckle can adjust the length of the collar. SIZE: X-Small [13-14.2'' / 33-36cm]. Small [13.8-17.7'' / 35-45cm]. Medium [15-22" / 38-56cm]. Large [15.8-23.7'' / 40-60cm]. (This is X-Small Size, Not Small.) THE ASIN OF MORE SIZES: Battery-powered: Small Size: B00M8183H6; Medium Size: B00M81YZ1O; Large Size: B01N4IFSPM. Rechargeable: B01M7SCLVH.