For your safety, this light will blink when you open your door give out warning to any vehicle aproaching from behind. So they may react immediately thus avoiding accident.
This light uses battery and magnet to on or off.
When you close door, it automatically turn off by magnet we stick at the door as well.
Battery can last up to one year.
If you COD, i can install free for you.
Office hour at Taman Desa area
Off hour at Puchong