Calculating your blood alcohol Level (BAC) over an evening.* Setup body settings (body settings)* Setup cubic units (options)* Setup a list of the kind of drinks you prefer (options, add drinks) (there is a generated start list with CL units)* Start the app* Everytime you finish a drink, pick it on the list and click "DRINK"* The app will instally raise your BAC to the level of the comumsed drinks, then slowly decrease your BAC as you burn alcohol.*********** THE APP IS CALCULATING YOUR BAC, NOT MEASSURING IT LIKE A BLOOD SAMPLE********