TKOOFN 35W H7 9005 2x HID Xenon Bulbs Black (Intl)

This will depend on the type of vehicle you drive. For most vehicle, the headlights have 2 bulbs each: one for low beams and one for high beams. In this case, you will need one regular HID kit for the low beams. If you also want your high-beams to be HID lights, you will need a second regular HID kit.

On some other vehicles, the headlights have one bulb each. This bulb performs the function of both the high beam and low beam. In this case, if you want to keep the high beam and low beam functions, you will need to install a special HI/LO kit. The HI/LO HID kits have special bulbs that perform both high and low beam functions.