LED dog collar is highly reflective and the LED is so bright and can easily be seen. It's strong and is made of nylon webbing, TPU optic fiber, and light guide. It is 30% brighter than other similar products. It improves your cat or dog's visibility and enhances safety at night. The LED pet collar can be recharged by the included USB cable. It takes only 1 hour to get fully charged and it'll work for 7-8 hours. Simply clicks to change the light between steady mode, rapid flashing, or slow flashing. Waterproof LED pet collar can work with all weather conditions. After charging, please close the battery cover. You can simply slap your pet's Apple AirTag onto the collar without worrying that the AirTag will fall out or get lost. You do not required to purchase an additional Apple AirTag holder. The length of each LED pet collar can be adjusted with the adjustable buckle. Apple AirTag is not included.