X10 PUM01 Universal Module/Receiver;

The alarm control module (CM506) contains an piezo sounder (beeper) which is used to indicate out of range conditions in the aquarium. This control module also has an isolated contact relay which can be used to open and close circuits. Either the sounder, the contact relay or both may be activated by the AquaController. The sounder and the relay can either momentary or continuous operation. The contacts are rated for 5 amps at 24 volts DC. The physical dimensions of the module are 2.3" x 3.6" x 1.8".