If you need any kind of support
If you need any kind of support, do NOT buy airgradient devices. They have tons of excuses and then they disapear instead of replace a malfunction sensor for 10$. If you live anywhere, where it's below 0 degree celsius, do NOT buy airgradient devices. It shows 0 when it's really -4 outside, so if you trust the outdoor device. Things will freeze and get destroyed! Indoor devices seems to work at least!