Uses high-quality modern led lights that glow brightly-one of the most effective high-visibility dog safety collars available. Rechargeable via micro usb-can be charged via phone chargers, laptops, computers, tablets, smart tv usb power adapters (micro usb cable included) Weatherproof-good for all conditions, adjustable and comfortable for your dog. A variety of brightness modes, can be adjusted to fast flash, slow flash, or constant brightness by pressing the button. One Size Fits All: Necklace measures 50cm (Note: Length includes switch) -Can be cut to any length using scissors to fit your pet! Perfect fit! Safety first, makes you & your dog more visible at night and in low light! Specifications: Color: colored, orange, pink, red, green, blue Material: abs + pvc Length: 50cm Package Includes: 1 x pet dog collar 1 x USB Charging