Large Yellow LED PET DOG CAT , ADJUSTABLE NYLON COLLAR Night Safety*Ships from Usa* Dog Collar with LED light that glows in darkness. ( Ships From California ) Provide safety for your dogs and pets while it's out alone at night Easy to use: simply pushing the control button makes the light ON/OFF Battery: 3 * LR44 button batteries (pre-installed), Bright light can be seen from far away Measurements : adjustable from 10 to 19 inches , Width : 1 Inch