NEW System Sensor CO1224T RealTest Technology Detector EXPIRATION 10/2027
New. Expires 10/27
System Sensor 2351B Addr. smoke detector, 2251B replacement, not from China
System Sensor 2351B Addressable smoke detector, 2251B replacement, shipped from Illinois, not from China. These are direct from System Sensor. B300-6 Base is not included. The base did not change, so if you’re replacing a bad detector head, the base should work fine.