This Simplex 2001 motherboard (model 556-663) is a reliable and high-quality unit for your fire alarm needs. It has been refurbished by the seller and is ready for use. With a brand like Simplex, you can trust that this motherboard will provide excellent performance and peace of mind.

It is important to note that this unit is suitable for use in the United States and comes as a single unit. Whether you're looking to replace an old motherboard or set up a new fire alarm system, this Simplex unit is an excellent choice. Buy with confidence from a trusted eBay seller.