The system can be operated thermostatically or manually from the transmitter. The system operates on radio frequencies (RF) within a 20'’range using non-directional signals. The system operates one of 1,048,576 security codes that are programmed into the transmitter at the factory; the remote receiver’s code must be matched to that of the transmitter prior to initial use. Review COMMUNICATION SAFETY SECTION under TRANSMITTER section and THERMO SAFETY SECTION under REMOTE RECEIVER section. These