The T9 thermostat works very well. The remote sensor surprisingly works very well in conjunction with the main thermostat in my tri-level home. I have achieved the best temperature uniformity with this device.
It's okay, but needs improvement. Currently you can't adjust the working screen brightness. This is the screen brightness when using the keypad, when adjusting the temperature for example. It's always the same level of brightness, so at night when it's dark and you want to adjust the temperature, the display light is blinding. The resting mode brightness can be adjusted automatically based upon the time. This feature needs to added to the working screen brightness level. The second improvement should be to change which weather service is displayed. Currently, it is AccuWeather which is incredibly bad, and always wrong. We should be able to pick the weather service we like such as the Weather App on my iPhone.
I love the T9 Thermostat!! My previous smart Thermostat never functioned consistently and was never satisfied! The T9 has been installed for two months now and had performed 100% of the time. I love the added thermostat in our Main bedroom for controlling our nighttime temperatures! Works perfectly with Alexa commands!! I highly recommend this product!!