... 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 ... daysPayment terms: Western union, money gram, T/T, paypal mini pet collar with flashing LED lights XS size