1、Easy to carry, tiny volume with king ring design. 2、Energy saving, 2pcs AAA batteries last for 1 year standby. 3、LCD display gives you clearer view and digital alcohol automatically gives you audible alert. 4、Auto power off, turning off automatically after testing 10s. 5、Environment and healthful. Blowing design with five mouthpieces for multiple users. Features: Easy to carry, tiny volume with king ring design. Energy saving, 2pcs AAA batteries last for 1 year standby. LCD display gives you clearer view and digital alcohol automatically gives you audible alert. Auto power off, turning off automatically after testing 10s. Quick response and resume, build in semiconductor alcohol sensing chip. Environment and healthful. Blowing design with five mouthpieces for multiple users. Specifications: Color: Black Material: Plastic Sensor: Semiconductor Alcohol Sensor Warm-up time: 10 s Answer time: 5~10 s Operating temperature: 5~40 ℃ Test range: 0.00-0.19% BAC, 0.0-1.9g / L Power: 2x1.5 v AAA alkaline batteries (Not included) Size: 11.3*7.0 * 2.1cm/11.3*2.8*0.8in Package Weight: 80g/2.8oz How to use: 1. Long press the start button. 2. when it shows "warm up", please wait for 10 s Blow. 4. Take a deep breath and blow out mouthpieces. 5. result exit 1 s. 6. After the test, it will automatically turn off after 10 s. Package List: 1 * Digital Alcohol Tester (Battery Not Included) 5 * Nozzles 1 * Manual