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This product monitors the shower temperature while you are waiting for it to be hot enough to shower in. The interface is relatively simple. The blue LED lights up when the thermistor detects the user's ideal temperature. At this same time of reaching the ideal temperature, the IFTTT applet is triggered and sends a notification to my phone via SMS. The green, yellow, and red LEDs serve as subtle indicators of how long the shower has been, in intervals of 3 minutes: From 0 to 3 minutes, the green one will be illuminated, from 3 to 6 minutes, the yellow one will light up, and from 6 minutes onwards the red light will be on. 

A video of it in action:

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