road way safety,solar road stud,102*81*21mm size;4pcs led,Red, ... mcdICFrequency2.5HZ ±20Operating timeSustain power supply continuously for over 72 hours by shined for 8 hours with standard luminous intensity Temperature range ... 3 years used in an efficient wayApplicationEdge line road way safety,solar road stud,102*81*21mm size;4pcs led,Red ...