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Contact controlled GSM phone caller, with free call controllable relay output, with temperature alarm and thermostat functions. Upon receiving input contact, provides alarm calls and text messages to a maximum of 4 phone numbers.
The output of the relay can be controlled from 4 phone numbers, with caller identification, at any time, plus from another 4 phone numbers on an occasional basis, up to an adjustable date. The dates for occasional control can be modified easily in a text message, thus an electronic key for AIRBNB can be provided and deleted. When set to operate without caller identification, an unlimited number of users can control the output relay.
The integrated thermometer of the unit can measure ambient temperature with an accuracy of ±2°C, which can be queried in a text message. Temperature alarm threshold values (lower, upper, or both) can be set, which trigger alarm calls, text messages, and even the output relay can be controlled like a thermostat, which resets after reaching the needed temperature.