1. LCD display 2. The opening size is 41mm in diameter (the measurement has a small error) 3. Overall diameter 45.2mm (the measurement has a small error) 4. Humidity display 5. Humidity measurement range 10%-99% Humidity display resolution 1% The humidity sampling cycle is 10 seconds (1 minute) Humidity measurement accuracy: ±5% Rated DC1.5v (1xAG13 button battery)or 2xLR44 batteries(Not included) Temperature measurement range: -50°C to 70°C Temperature measurement accuracy: ±1 degree (under normal temperature) Battery installation: Flip to the back of this product; Push open the battery cover in the direction indicated by the Pi; Put two LR44 button batteries into the battery slot Due to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal use Colour:White Material:ABS Package Contents: 10 x Round electronic 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.