The TP-Link Tapo T315 is a smart device designed to monitor temperature and humidity with high accuracy. It features a 2.7" E-ink display and operates within a wide temperature range of -20 to 60ºC and humidity range of 0% to 99%RH. The device requires a hub for operation and is powered by two AAA batteries. It communicates wirelessly at 868/922 MHz and refreshes data every 2 seconds. The package includes the monitor, batteries, adhesive, and a quick start guide. Specifications: Operating Temperature: -20~60ºC Operating Humidity: 0%~99%RH Display: 2.7" E-ink Power: 2 × AAA batteries Wireless: 868 / 922 MHz Temperature Accuracy: ±0.3°C Humidity Accuracy: ±3%RH Data Refresh Speed: 2s Package Contents: Monitor, batteries, adhesive, quick start guide