This is a genuine Ryobi replacement part. The ignition module is designed by the manufacturer for use in trimmers and blowers. This item includes the ignition module, ground tab, and two metal screws for attachment. It is used to carry electricity from the starter assembly to the spark plug. You may require a screwdriver or Allen wrench when replacing this item. This part is sold individually.
OEM stands for Original Equipment Manufacturer. Simply put, this means that the company who made your appliance is also supplying the replacement part for it.