Size XS =Width 2.0CM *Length （36-41）CM S = Width 2.5CM * Length (42-44) CM M = Width 2.5CM * Length (45-48) CM L = Width 2.5CM * Length (49-52) CM XL = Width 2.5CM * Length (53-58) CM
Flashing mode: Long light, Flash, Slow flash, Close( via switch control ) Battery: 2PCS CR2032 button battery-driven (60-80 hours, normal 2-3 months; battery can be replaceable, convenience stores or supermarkets are available .) Easy to use: By CE, ROHS, EN471 waterproof; the product is suitable for dark environment or walk the dog at night, outdoor and pet movement through the bright fiber optic light, it can be a warning, also it is Fashionable and Individuality.
The fashion designed collars can be used both in day or night which you turn on and off the light to control them.
Note: this dog collar already included 2 pcs CR2016 batteries