Using nRF52820 chips to reduce device performance consumption; Multiple combination functions can be achieved with just one device Equipped with a battery (CR2450), the battery life can reach up to 2 years; Detachable base for easy battery replacement. Application scenarios: Used for temperature and humidity detection in the environment, mainly including industrial workshops, shopping malls, museums, agricultural greenhouses, etc. Power supply: 1 * button cR2450 Power supply voltage: 3.0V Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:White Material:ABS Package Contents: 1 x Temperature and humidity sensor (with battery CR2450) 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.