Easier installation: only takes you 3 minutes for installation.
lights has '+' AND '-'. If it doesn't light up, all you need to do is insert it in the opposite direction or 180 Degrees.
All bulbs will be tested before shipping, please tell us freely when you have any other problem of the products.
Notes:
This LED bulb is polar sensitive, so in case the bulb won't light up, please flip it 180 degrees, if you have any other problem ,please feel free to tell us ,we are very happy to offer good service.