The memory 216 may also contain manufacturing information such as a serial number and model number, place of manufacture, date of manufacture, etc. [0032] In operation, one or more of the leads 204 of the sensor 212 are implanted within, or proximate to, the chambers of the heart so as to be able to provide an intracardiac electrogram (IEGM) signal to the processor 206 in a well known manner.