Made of standard silicone + ABS materials, super comfortable to wear and super safe. Also waterproof, so you can be worry-free in any weather. Three adjustable flashing possible: fast flashing, slow flashing and constant light, it can be adjusted according to your wishes and different situations. Super bright, visible up to approx. 500 m. Up to approx. 5 hours when flashing/approx. 2 hours with continuous light; full charging time: approx. 45 minutes to 1 hour. Adjustable length - great for all size dogs and cats: original length is 27.56 inches (70 cm), you can shorten the size of your pet's neck with scissors. USB charging: very simple and practical: no batteries required. It can be charged with mobile phone/smartphone/tablet and computer.