He has this sick ass teeth and eye color that is different from the usual offering of uv glass and this doesn’t take any special light and just holds a glow in the dark. It glows a blue tint and goes for a long time. These hot bright summer sunny days really throw it into crazy land and a standard uv light does too. When you walk into the dark from outside his growl will stand and animate your neck. Has the back window and hangs ear to ear. Comes with some bonus freebies tossed in and will come on an adjustable cord to be ready to wear right away.