Bluetooth Road Reflective Stud Light For Freeway With Spike. Bluetooth Solar Road Stud With Spike-Nokin Motorway Road Studs 2021/11/19 · Bluetooth Solar Road Marker Light With 30 Tons Compressive. NOKIN Bluetooth synchronized solar road stud NK-RS-A6-1 specification: LED Color is Red,Yellow,White,Blue,Green 5 colors for you to choose.