YoLink Smart Wireless Temperature/Humidity Sensor Wide Range for Freezer Fridge Monitoring Pet Cage/Tank Monitoring, App Alerts, Text/SMS, Email Alerts, Works with Alexa IFTTT, 2 Pack - Hub Included.

YoLink Technology YoLink is a proprietary wireless technology provided by YoSmart. which is based on the Semtechs 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, ZWave, and other smart home protocols, it has the advantages of lowpower consumption, longdistance coverage (wall penetration, and antiinterference. 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. Requirements: Smartphone or tablet running iOS 9 or higher, Android 4. 4 or higher Specification: YoLink Hub Power: Inwall power adapter Input: 5V DC Maximum Current: 1A Working Temperature: 20C50C (4F104FHumidity: 090% noncondensing YoLink TemperatureHumidity Sensor Voltage: 3V DC (2 AAA batteriesAlert Temperature: 22F 158F, 0. 54F (30C 70C, 0. 3CLow Temperature Alert Default: 64F (18CHigh Temperature Alert Default: 95F (35CAlert Humidity: 0% 100%, 3% Low Humidity Alert Default: 0% High Humidity Alert Default: 100% Working Temperature: 14F122F(10C50CWorking Humidity: 95% (noncondensingPackage List: 1 x YoLink Hub 2 x YoLink TemperatureHumidity Sensor Please Note: YoLink Hub requires a 2. 4 GHz WiFi connection or a wired connection. YoLink products work only in the USA and Canada.