M = Width 2.5CM * Length (40-48) CM
L = Width 2.5CM * Length (45-52) CM
XL = Width 2.5CM * Length (52-60) 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 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 a light to control them.