This bulb works in some scooters as a tail or brake bulb (it glows red). This base is the 'BAY15S' type, it has two pins at the same height for fitting and one terminal on the bottom. It is internally ballasted so can be plugged straight in place of your old one.
This LED gives a great upgrade from standard by offering the following:
brighter and more directional light than the standard item
usually lasts 5-10 times longer than normal bulbs
uses very little power
reacts instantly when power is applied (this means they come on more quickly than standard bulbs)
no heat is emitted