Wrap Around -Night Time LED Blinkers.
Not only are these lights amazing for collars, but I have also used them on bikes and school bags. A must have at this price.
Silicone rubber with LED Light. 100% water resistant. Removable battery. Novel design allows you to push the paw to activate, and push again to choose your favoured light speed. Constant or 2 speeds of blinking. The silicone hoop cleverly wraps around any collar, clipping on safely & securely. Can be seen up to 1/4 of a mile away.