Accurate real-time measurement BT thermometer and hygrometer with E-ink display, supports Apple /Mi Home APP, multiple installation methods, energy efficient, beautiful and practical. Features: E-ink display, clear and easy to read, like printed text on paper. Built-in Swiss sensor, accurate real-time measurement, temperature and humidity at a glance. Supports Apple /Mi Home APP, remote data viewing, activation of automation, convenient and fast. Multiple installation options, magnetic wall stickers, desktop brackets, built-in magnets, suitable for various places. Powered by CR2430 button battery, energy efficient, battery life up to 8 to 12 months. Specifications: Model: T(Thread+BT)/M(BT)Optional Color: White Temperature Measurement Range: 0 ~ 50°C Humidity Measurement Range: 0 ~ 99.9%RH (No condensation environment) Battery Type: CR2430 Button Battery Screen Size: 55x55mm / 2.17x2.17in Size: 74x74x14mm / 2.91x2.91x0.55in Weight: 54g / 1.9oz Package list: 1 x Thermometer and Hygrometer 1 x CR2430 Button Battery 1 x User Manual