In Pictures: 10 cool Bluetooth devices for your iP...
BACtrack breath analyzer
Let's hope that you don't have an urgent or regular need for this device. The $150 BACtrack Mobile breath analyzer analyzes the amount of alcohol in your breath, and the companion iOS and Android app tracks your tests to give you a history of intoxication levels. If you or your friends tend to indulge too much, this device can help objectively identify who shouldn't be driving, and help motivated people use the history to retrain themselves in terms of their drinking habits.
In Pictures: 10 cool Bluetooth devices for your iPhone or Android