Using the Morimoto 4TL - R Bi - Xenon Projector is straightforward. First, make sure you have enough space as it requires some spacing to fit in place of OEM 4G TL projectors. Carefully remove the old projector and install the new 4TL - R projector, connecting the D2S twist - on bulb holder and the 9006 pigtails for solenoid inputs. When it comes to maintenance, keep the lens clean. You can use a soft, dry cloth to wipe off any dust or dirt. The projector comes with a 3 - year warranty, so if you encounter any problems during this period, contact the manufacturer. Remember, this product is sold individually, so get as many as you need for your vehicle.