This product is mainly used to detect ambient temperature, humidity, and ozoneconcentration. When the concentration exceeds 5.0ppM, it emit a beeping alarmsound to alert users to environmentalchanges. Measurement technology: electrochemical detection technology measurement range: 0-9.9PPM measurement accuracy: 10% Temperature measurement range: -10-50C Button Definitions: 1. Long to power on, short to switch to Fahrenheit, 5 times consecutively to calibrate the sensor 2. Long to enter standby mode, short to turn off the buzzer alarm 3. Real-time temperature, humidity, and concentration values; battery level, alarm status. 4. TYPE-C charging port 5. concentration indicator light Humidity measurement range: 5-95%RH Battery capacity: 400mAh Battery life: 18-40 hours Charging time: 1 hour Charging method: USB-type-c Screen material: TFT color screen Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color:Black Material:Aluminum Alloy Package Contents: 1 * Detector 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.