Small size and low power consumption, the product size is about 1.3 x 1.3 x 0.47 inches. It can measure indoor high temperature, low temperature and normal temperature, and the measurement speed is fast and the measurement temperature is accurate. Smart Bluetooth app, connect up to 100 at the same time. Temperature range: -20-60 ° C (-4-140 ° F); humidity range: 0-99%. Support temperature data export function, record a group of data every 10 seconds. Use CR2032 battery,and battery can be replaced. Colour:White Material:plastic Package Contents: 4 x Temperature Humidity Sensor 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.