Mercury MR52-S3 Series 3 Dual Reader Interface Module. Listing is for 1 board. Please see my other listings. This item is in the category "Business & Industrial\Facility Maintenance & Safety\Surveillance & Alarm Equipment\Alarm Systems & Accessories\Alarm Control Panels & Keypads". The seller is "chopper396" and is located in this country: US. This item can be shipped to United States.