Let me tell you, these little white discs have completely transformed how my home feels. I've got one in my home office (where I spend 90% of my day) and another in the nursery - and wow, what a difference!

The setup was shockingly simple. Like 'pair-your-airpods' simple. Pop in the batteries, open the Resideo app, and bam - they connected to my T9 thermostat faster than I could make coffee. Though fair warning: that included 3M tape? Not my favorite. My nursery sensor took a tumble after two days (luckily onto carpet). I ended up using command strips instead.

Here's where these shine: motion tracking. When I'm working at my desk, the system now prioritizes my office's temperature over other rooms. No more freezing while the thermostat thinks everyone's in the living room! And at night? It automatically switches to monitoring just the nursery - no more midnight thermostat adjustments.

The humidity readings have been a surprise bonus. Turns out our guest room was way more humid than we realized - probably why visitors always complained about stuffiness. Now we can actually address it.

Battery life update after 3 months: still going strong despite constant use. Though I did buy some lithium AAAs just in case after reading other reviews.

My only gripe? The app could show historical data better. I want to see how temperature fluctuates throughout the day, not just current readings.

For anyone with a multi-story home or rooms that always feel 'off' temperature-wise? Worth every penny. Just maybe skip their tape solution.