Know the current temperature level at the sensor's location. Check remotely using the YoLink app, anytime and from anywhere Create customized alerts, to be informed of high- or low-temperature or humidity levels via emails or app push notifications. Create custom automation using the YoLink app, to trigger responses from other YoLink devices, such as the Siren Alarm or the SpeakerHub, our audio, talking and sound/tone-playing hub Lower cost of ownership than other technologies; low-power operation means batteries may last over 2-years, compared to 1 or less from other brands. Uses standard AAA lithium batteries, included Extended sensor operating range of minus 22°F to 158°F, Alert range of minus 22° Self-calibration available via the YoLink app Historical temperature and humidity graphs displayed in hourly, daily, weekly and monthly figures Home Assistant integration: automate and integrate, using the Home Assistant automation platform..