The LED light will flash in nighttime and will not flash in daytime. You can cover the other end by dark paper if you want it to flash in daytime. This LED alarm does NOT require a car alarm system. No wires needed, just stick it to the roof of the vehicle with corresponding glue.
Solar energy can be absorbed and saved in high efficiency solar cells. You need not install battery. It's powered by solar. I have tested by myself that this LED can blink for whole night after enough sun shining in daytime. You need not put it under sunshine directly.Sunshine above the dashboard is enough. It can be charged by solar whether you put switch to "on" or "off". Demention: 52.5cm (21 inches). You need a ballpen or little stick to push it. Handle Time: PDT 01:00 / GMT 09:00.
In One Day (Excluded Sunday & Holiday). Customer Services Time (Excluded Holiday). 00:00-04:00 20:00-00:00.00:00-01:00 17:00-00:00. Solve any problems with you in friendly way after communication. Well-Packed protects your items with suitable material so as to avoid damage during transit. ECheque will be held until cleared. The item "Blue Fake Simulation Car Alarm Security System Warning Theft Flash Led Light" is in sale since Friday, August 28, 2015. This item is in the category "Vehicle Parts & Accessories\Car Parts\Interior Parts & Furnishings\Interior Lighting". The seller is "goodserviceliu" and is located in CN. This item can be shipped worldwide.