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 and should be available at any pharmacy or grocery store.

Easy to use: Waterproof; the product is suitable for dark environment or night walks, bright fiber optic light. The fashion designed collars can be used both in day or night. You can turn on and off a light to control them.