Smart Temperature and Humidity Monitor SPEC: 868 MHz, battery powered(2*AAA), 2.7 inch E-ink display, temperature range and accuracy: 0?~50?, "0.3??humidity range and accuracy: 0~99%RH, "3%RH Feature: Tapo smart app, Tapo IoT hub required, smart action, clear and sharp E-ink display, real-time monitoring and expression display, 2s Refresh time, 2 years Date storage and export, alart and notification, face icon comfort indicator, battery included, 3M bonding tape and magnet included, CE/UKCA certified.