light up LED pet color size: XS, 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 1.5cm 18-28cmS 2.5cm 32-45cmM 2.5cm 40-48cmL 2.5cm 45-53cmXL 2.5cm 52-63cmThe size XS don ...