BACtrack Skyn is a wearable biosensor that measures the alcohol coming from your skin and then estimates your blood alcohol content (BAC) range, in near real-time. Simply slide Skyn on to your wrist, connect to the BACtrack Skyn app via Bluetooth, and youre good to go. For Investigational Use Only. The performance characteristics of this product have not been established. BACtrack Skyn should not be used as a tool to determine whether you should operate a motor vehicle or equipment, or perform any other dangerous act. Do not drink and drive.