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%. 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.