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Honeywell TC500A is a smart thermostat, which is used in the commercial building to make the environment comfortable and help to save energy. It consists of a display module and a universal wall plate. The modular design can help to extend a serial product to meet different requirements and easy to change or upgrade. With 4 levels of access and control, TC500A can meet most using scenarios requirement, including public area, office, private area etc. TC500A is the most compact commercial thermostat with 24 terminals in the world. Protruding glass and 2-color and groove housing design make it looks even slimmer and purer.