S = Width 2.5CM * Length (35-43) CM
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.