This is a standard size CANBus HID Ballast from Lumens. These are sold in singles (Price is PER ballast)
Wattage: 35W ± 0.5W (ie. 34.5W - 35.5W)
Digital ballasts also converts DC power from vehicles to AC power, but also have added DSP chips to improve the stability of power used to power the HID bulb. With a smaller fluctuation in power, the HID bulbs will reach their potential lifespan.
All Lumens products have 90 days of warranty.