this is a used breathalyzer.........tested and works..it showed .1 for me with a small glass of wine and a can of beer... ..you will need 2 AAA batteries for this device...cleaned with bleach and alcohol on the outside.......avoided anything down in the opening........has a small crack in the screen area.......does not seem to affect anything........does have light surface scratching around it............no manual and nothing else included except for what you see..........sn# 5299943
