Feb 16, 2022 · Aug 11, 2021 · Synchronized Led Road Stud For Urban Road-LED Road Studs. 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. Solar road stud Working model is Synchronized flashing (2Hz). Working hours is 55hours after fully charged.