New-Generation LED Flashing Pet Collar & Leash necklace that give fantastic lights on pet"s neck. * Three blinking modes available-fast flash, slow flash and light on * With lithium 2piecs CR2032 button batteries(include) which can keep on flashing for 60-80 hours (blinking mode) and 30 hours (light on mode) * With S, M, L, XL sizes available. * Safety Guaranteed.