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This alcohol monitoring wristband just won a $200,000 prize

The BACTrack Skyn measures your sweat to help determine your blood alcohol content.

Soon, you may be able to strap a gadget on your wrist to keep tabs on your alcohol consumption.

It's called the BACtrack Skyn, and it's not a breathalyzer. You don't need to bring it up to your mouth. Instead, the gadget uses an electrochemical sensor to measure your sweat -- which, when you're drinking, will typically contain ethanol. Then, it sends the data to your iPhone over a Bluetooth connection.

It's not a very quick way to tell whether you've knocked back a few too many, because the breathalyzer company says it can take up to 45 minutes for the telltale ethanol to escape through your skin, compared to 15-20 minutes for a breathalyzer, according to a rep.

But unlike a breathalyzer, the Skyn can offer continuous data about your blood alcohol level and use that data to suggest when you might want to slow down.

The Skyn was innovative enough to win a $200,000 prize (that converts to about £138,000 or AU$276,800) from the National Institute of Health, the top prize in their Wearable Alcohol Biosensor Challenge. BACtrack plans to sell "limited quantities" of the device in Q4 of this year, followed by wider commercial availability.

BACtrack also recently pledged to support Google's Project Ara, an attempt to make a smartphone where you can add new features by swapping out Lego-like modules.