The Exhale device connects via latest technology Bluetooth 4.0 with your smartphone. Featuring high precision alcohol measuring sensors and intelligent low power design, the device is able to run for up to 50 uses on a single battery cycle. Designed to be extremely portable, the device also includes a highly reliable Lithium-Ion battery rechargeable via standard a Micro-USB port. Once connected, the app not only tells you relevant information about your BAC level, but it learns how your body functions and gives you even more accurate data. Also, it gives you a variety of options about what you can do next such as telling you if you shouldn’t be driving, letting you know how long you should be waiting before you can legally drive, gives you the option to call a cab or a friend to pick you up and much, much more.