Smart Temperature and Humidity Sensor SPEC: 868 MHz, battery powered(1*CR2450), temperature range and accuracy: -20?~60?, "0.3??humidity range and accuracy: 0~99%RH, "3%RH Feature: Tapo smart app, Tapo IoT hub required, smart action, high accuracy monitoring, alart and notification, 2s Refresh time, 2 years Date storage and export, battery included, 3M bonding tape, adhesive magnet and lanyard included, CE/UKCA certified.