Electronic ink screen, white "paper" black characters show more clearly In desktop mode, open the stand and it can be placed steady on the desktop Wall mode, built-in magnet can be rotated to adjust the angle Ultra-wide viewing angle, almost 180°, it is easier to see the temperature and humidity in the room Sensirion high-precision industrial grade sensor with fast response, accurate measurement and no drift Low power consumption, battery can year With Bluetooth-compatible function Automatically record temperature and humidity history data for up to 30 days (requires APP connection) Product Name:ClearGrass Bluetooth-compatible Thermometer and Hygrometer lite Product model:CGDK2 Product weight:59 grams Screen size diameter:55 mm Temperature range:0℃ - 50℃ Humidity range:0 - RH Wireless Network Bluetooth-compatible 5.0 Battery type:CR2430 button battery (no included) Colour:White Material:ABS Size:diameter 74 mm, thickness 14 mm Package Contents: 1 * Bluetooth Thermometer and Hygrometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.