1.Painted shell to be smooth and antioxidative.2.Embedded reflector,wontt remove from the road stud.3.High brithness reflective sheet4.Battery and super capacitor optional. Inquiry details detail. Plastic LED Wired road stud used in the tunel. 1.used in the edge of tunnel2.work with DC 12/24V,AC110-220V3.five led colors are available.