Feature: 1. Personal Digital Respirator: This reusable alcohol tester kit monitors your blood alcohol level to make sure you can drive or take a taxi safely! 2. Fast and accurate results: Our portable alcohol tester is designed with a sensitive sensor system to tell you if the legal limit is exceeded, and an automatic alarm will sound if you exceed certain BAC. 3. Easy to use: Just make sure you have the battery to plug in, then just connect the mouthpiece, pre the start button to initialize the countdown, and finally blow for 3-4 seconds after "blo" is displayed. 4. Wirele and battery powered: This approved set uses two AAA batteries (not included) so you can stay powered up and ready to go. Replace batteries as needed for long-term support. Descriptions: This reusable breathalyzer kit (with free tote bag) monitors your blood alcohol level to make sure you can drive or take a taxi safely! Our portable breathalyzers are designed with a sensitive sensor system that can tell you if you've exceeded legal limits, with an automatic alert if you exceed certain BAC. Specifications: Size: 95*36*16 mm Detect range: 0.00~0.19% BAC & 0.0~1.9g/l. Power supply: 2 x AAA batteries (not included) Packing Content: 1 pc * Digital Breath Alcohol Tester 1 pc * English manual 1 pc * Strap Note: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.