The MP202 and MP204 are wall-mounted, microprocessor-based control units housed in weatherproof enclosures. The MP202 is a two-channel controller which can be used for 1 or 2 sensor channels, while the MP204 is a four-channel controller which can be used for up to 4 sensor channels. A front door keypad enables convenient operation of the controller without the need to open the enclosure. Standard features include: 3 alarm setpoints per channel, digital display per channel, common relays (optional individual relays), operates on 110/220 VAC (autoswitching), and 24 VDC power supply to power sensor transmitters. Both the MP202 and MP204 can be used with either our standard sensor transmitter (SM95) or our intelligent sensor transmitter (4-20IQ)