Long press to power on, short press to switch to Fahrenheit, press 5 times consecutively to calibrate the sensor Long press to enter standby mode, short press to turn off the buzzer alarm Real-time temperature, humidity, and ozone concentration values; battery level, alarm status TYPE-C charging port Ozone concentration indicato Since this product has a built-in electrochemical sensor, please note the interference fromother gases on the sensor readings. For every 100PPM of the following gases. thecorresponding ozone reading is affected as follows. Hydrogen sulfide:-20PPM Nitrogen dioxide:110PPM Chlorine gas:90PPM Sulfur dioxide:5PPM Nitric oxide:2PPM Carbon monoxide,ammonia, hydrogen, carbon dioxide: 0PPM Color:As Shown Material:Aluminum Alloy Package Contents: 1 * Ozone Analyzer