YoLink Technology<br> "YoLink" is a proprietary wireless technology provided by YoSmart. which is based on the Semtech's LoRa wireless technology combined with the YoSmart smart home/building protocol, to provide the most advanced smart home/building devices solution. Compared to WIFI, Bluetooth, ZigBee, Z-Wave, and other smart home protocols, it has the advantages of low-power consumption, long-distance coverage (wall penetration), and anti-interference. It is the first smart building/home protocol that can be very easily setup and is a very low cost but creates a reliable, robust and more secure IoT network.<br><br> Requirements:<br> Smartphone or tablet running iOS 9 or higher, Android 4.4 or higher<br> <br> Specification:<br> YoLink Hub<br> Power: In-wall power adapter<br> Input: 5V DC<br> Maximum Current: 1A<br> Working Temperature: -20°C~50°C (-4°F~104°F)<br> Humidity: 0~90% non-condensing<br> <br> YoLink Temperature & Humidity Sensor<br> Voltage: 3V DC (2 - AAA batteries)<br> Alert Temperature: -22°F ~ +158°F, ±0.54°F (-30°C ~ +70°C, ±0.3°C)<br> Low Temperature Alert Default: 64°F (18°C)<br> High Temperature Alert Default: 95°F (35°C)<br> Alert Humidity: 0% ~ 100%, ±3%<br> Low Humidity Alert Default: 0%<br> High Humidity Alert Default: 100%<br> Working Temperature: +14°F~+122°F(-10°C~+50°C )<br> Working Humidity: ≤95% (non-condensing)<br> <br> Package List:<br> 1 x YoLink Hub<br> 2 x YoLink Temperature & Humidity Sensor<br> <br> Please Note:<br> YoLink Hub requires a 2.4 GHz Wi-Fi connection or a wired connection.<br> YoLink products work only in the USA and Canada.