Quickly find out if you’re safe to drive with the BACtrack Go Portable Keychain Breathalyzer. Using Advanced MicroCheck, this compact alcohol sensor accurately determines BAC in no time. Tiny enough to carry on your keychain, the BACtrack Go’s mouthpiece folds away when not in use for extra protection. Likewise, it comfortably fits inside your pocket or purse. In addition, the innovative mouthpiece only allows your breath into the breathalyzer, keeping ambient air out. To use the BACtrack Go, simply turn the device on to start testing in seconds. The results will show up on the LCD screen in an easy-to-read bright blue color. Furthermore, the portable breathalyzer comes with three extra mouthpiece covers so your friends and family can use the device as well.