Advanced semiconductor sensor with high sensitivity and quick results, easy to use. Displays results in digital and cartoon modes, allowing anyone to check their status. Five result levels: very good, normal, not very good, bad, very bad. Features a digital LCD display with orange backlight for energy efficiency and eye comfort. Fast response time and self-check feature to indicate different conditions. Portable, compact design fits easily in your pocket. Non-contact operation; breathe 5-10mm from the sensor for better hygiene. Energy-saving design with low battery indicator and long-lasting use from 2 AAA batteries (not included). Usage: Open the battery compartment, insert 2 AAA batteries, and close it. Press the power button to start a 9-second countdown. When the screen shows "C", breathe evenly for 3 seconds at the air inlet. After a beep, results will be displayed for 5 seconds before automatic shut-off. Press the power button again to retest. Specifications: - Sensor type: semiconductor sensor - Warm-up time: 9 seconds - Blowing time: 5 seconds - Working environment: relative humidity �� 95% (no dew) - Power: 2 AAA batteries (not included) - Item size: 95 x 36 x 18mm / 3.74 x 1.42 x 0.71in - Color: white - Material: plastic Package Contents: 1 x breath detector (battery not included) 1 x instruction manual Note: Colors may vary slightly due to lighting and display differences. Measurement error is �� 1-3cm.