Description This very portable breath tester can be with you at all times. Keep it either on your keyring, handbag, purse or on your belt hook. The background light helps you to see the read-out clearly. So avoiding any confusion and keeping you safe to go. Features: LCD screen display Auto power off for saving battery Breath alcohol concentration testing Quick response and resume capacity Threaded by a strap in order to be more convenient to carry It can be used in a wide variety of settings including clinical test applications and for personal use. How to Use: Press the power button; the alcohol tester LCD will turn on with one beep sound. The "warm-up" symbol is displayed, and the 10 to 0 countdown is started that indicates the tester is in warm-up mode.How to Test: The "Blow" symbol is displayed when warm-up and the 10 to 0 countdown is started that indicates the tester is in testing mode. Near and blow into the breath inhaler for 3-5 seconds. Read the test result from the alcohol tester LCD. The "Caution" symbol is displayed if the alcohol concentration is the level: 0.02% BAC(or 0.2g/l) to 0.05% BAC(or 0.5g/l).0.05% BAC(or 0.5g/l) to 0.08% BAC(or 0.8g/l). The "Danger" symbol is displayed with beeping audible alert if the alcohol concentration is the level: over & equal 0.05% BAC(or 0.5g/l).over & equal 0.08% BAC(or 0.8g/l) Note: 1. Size may be a little deviation due to manual measurement. 2. Different displays show the same picture may be slight differences. Specification: Material: ABS Reaction time: 5s Warm-up time: less 10s Accuracy: 0.01% BAC (0.1g/l) Product Size: 9.5x3.6x1.8cm Power By: 2 x 1.5V AAA Battery(Not Included) Detect Range: 0.00%-0.19% BAC (0.0-1.9g/l or 0.00-0.95mg/l BRAC)