Range of excellent options, exactly what I needed. I needed to sense the temperature in a separate room from the thermostat, and with there compatible room sensors I can do that.
I love this product. It is simple yet useful. The app to manage the product is user friendly. You all did a great job on this product. The best features is the user friendly app and geofencing.
the main purpose is to have a remote temperature sensor without having to move the wiring & thermostat. The T9 works well for this purpose, except for a few of draw-back: (1) it needs a clock battery back-up as we get frequent power outage; (2) while it can get time setting from wifi-router, our router clock is only set at GMT time, not local time; (3) being wifi-router time dependent, the router has to be on 24/7; (4) screen back-lightning brightness setting doesn't seem to work (too bright)