The ultra-portable BACtrack Vio transforms your smartphone into a breathalyzer. Quickly and easily estimate your blood alcohol content (BAC), track your results over time, and with ZeroLine®, estimate when your BAC will return to 0.00%. You can even call an Uber™ directly from the BACtrack App if you've had too much. Features wireless Bluetooth connectivity, innovative tracking, personalization, and Apple Health integration tools. Compatible with most iPhone and Android devices. Perfect for BAC testing on the go, the Vio fits inside a purse or pocket and can be used as a keychain.