Track indoor climate conditions to help prevent mold, moisture damage, or discomfort, even in hard-to-reach places. Our next-gen smart sensors protect where others can't. Inside, outside, and beyond. Built to break free from traditional systems with no need for hubs or the limited reach of Wi-Fi. On Amazon Sidewalk, these devices stay connected for reliable protection day and night. Add more devices anytime to expand your coverage as your home security needs grow.