... , S, M, L, XL color: red, yellow. green, blue battery: 2pcs CR2016 battery LED light up pet colarColor: red, yellow, green, blueFunction: quick ... blink/ slow blink/ consant on/ off Battery: 2* CR2016 battery. battery is includedSize: XS, S, M, L, XLMeasurement:Size Width LengthXS ...