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CP-P00-00-0. Condition is "New". Shipped with USPS Priority Mail. Duct Mount CO2 Transmitter still in box unopened. Serial No J1240015. No returns on this item. I may have more of these available. Contact me if you need more. If your looking for the updated version look for CP-P100-00-0, but if your just replacing the same one this works as well for less cost.