It’s like a Fitbit that prevents hangovers.

It’s 2am and you’re doing an interpretive dance in the middle of a dive bar. Suddenly, you ask yourself: how the hell did I get this drunk and why are my friends laughing and Snapchatting the entire thing?

Enter the BACtrack Skyn, a brilliant piece of wearable tech that will prevent all future messy situations like this. Just like a Fitbit tells you when you’ve hit your steps, the BACtrack Skyn tells you when you’ve hit your limit.

By measuring the levels of ethanol escaping through your skin, the band keeps track of your blood alcohol concentration and sends push notifications to your smartphone when you’ve reached a certain BAC. In other words, it’s the responsible friend you’ve never had.

The nifty gadget is available for pre-order on the company’s website. Check out how it works in the video below: