The NiteHowl, LED Safety Dog Collar Necklace, Flexible Polymer That's Illuminated By Bright LED & Can Be Recharged For Hours Of Nighttime Fun & Safety, Makes Identifying Multiple Dogs Easy With The Ability To Choose From 1 Of 3 Colors Red, Green, Blue, Polymer With Multiple Colors At The Same Time, Disc-O Mode Creates A Flowing Color Blending Pattern, Simply Trim The Flexible Polymer To Custom Fit, Durable, Weather Resistant Housing & Quick Press, Entire Collar Lights Up A Full 360 Degree, Making Your Dog Clearly Visible From All Angles.