White Bidirectional Road Stud Price Durban-Nokin . NOKIN 290 Road Stud. Road stud reflector can be surface mounted or inset into 301 casting. Solar road stud Working hours is blinking: 140h for NI-MH battery;130h for Lithum battery;30h for super capacitor after fully charged. Constant is 40h for NI-MH battery, 35h for Lithum battery,15h for