flashing LED dog pet collar size: XS, S, M, L, XL color: red, yellow. green, blue battery: 2pcs CR2016 battery LED light up pet collarColor ... is includedSize: XS, S, M, L, XLMeasurement:Size Width LengthXS 1.5cm 18-28cmS 2.5cm 32-45cmM 2.5cm 40 ... , XL has black border: 2012 colorful high-light LED flashing Dog Collar, flashing LED safe dog collar, LED Pet Collar