Vangold Nylon Pet Dog Collar Night Safety LED Light-up Flashing Glow in the Dark Lighted Circular Pendant Collar Nylon dog neck strap with LED flashing light Highly visible LED light glows and flashes in darkness With switch control to turn on the LED and change its modes Flash Modes: Quick blinking, slow blinking and steady light Powered by 2 x button batteries (pre-installed)