Product Description LED digital display, clear and easy to read Sensitive and high-precision: Utilizing advanced aerospace-grade semiconductor materials and a new language calculation method, test results are more accurate. Sound and color differentiation: Below warning value: A "beep" sound is emitted, and the indicator light turns green. Between warning and danger values: A "beep beep" sound is emitted, and the indicator light turns yellow. Above danger value: A "beep beep beep..." sound is emitted for approximately 10 seconds, and the indicator light turns red. USB charging, easy operation, automatic power-off, lightweight and portable, easy to hold and carry. Widely used for family gatherings, dates, and friend get-togethers, it is an excellent gift for relatives and friends, such as birthday gifts, Christmas gifts, Mother's Day gifts, Father's Day gifts, and adult gifts. Specifications: Type: Breathalyzer Model: 1216 Resolution: 99% Voltage: 4.5V Power Supply: USB Charging Warm-up Time: 10 seconds Response Time: 10 seconds Material: ABS Dimensions: Approx. 83 x 22 x 22 mm / 3.3 x 0.9 x 0.9 inches Package Contents: 1* Breathalyzer 1* USB Data Cable 1* Instruction Manual Notes: 1. Press and hold the power switch for 2 seconds to turn on the device. 2. The machine will perform a self-test and warm up for 10 seconds. 3. Take a deep breath and blow into the machine for 10 seconds. 4. When an accurate result is obtained, the indicator light will display a different color and emit a beep. The machine will automatically shut off after use. To ensure accurate test results, please wait 25 minutes after consuming alcohol before using the breathalyzer; please wait another 10 minutes before your next test for more accurate results.