Function:1. LCD display2. Opening size diameter 41mm (small error in measurement)3. External diameter 45.2 (small error in measurement) Product size: 45*15.5mm4. Weight:, gross weight 22g5. Humidity display6. Humidity measurement range 10%~99%7. Humidity display resolution 1%8. Humidity sampling cycle 10 seconds (1 minute)9. Humidity measurement accuracy 5%10. Rated voltage DC1.5v (1 LR44 or AG13 button battery)11. Temperature measurement range -50 to 7012. Temperature measurement accuracy 1 degree (at room temperature)Battery installation: Turn to the back of the product; push the battery cover in the direction indicated by the arrow; put the button battery in the battery slotInstallation and operation: embedded installationNote: Electronic products have errors, so don't buy them if you have high requirements. The humidity error of the product at room temperature is about plus or minus 5%, and the temperature is about plus or minus 1 degree.Package content: 1*black + 1*white