Smartphone Breathalizer Tells You When Not to Drive Home

To help prevent drinking and driving, a new keychain-sized breathalizer that snaps into your smartphone will tell you when it's safe to head home.

Called the Breathometer, the $20 device plugs into your iPhone's headphone jack. It's currently campaigning for funding on Indiegogo.com and has raised more than $17,000 in one day. It launched on Wednesday morning and is just shy of its $25,000 goal

Here's how it works: After downloading the accompanying app and securing the device, you blow into the Breathometer to register your blood-alcohol concentration. If you're over the legal limit, the app pulls up alternative transportation nearby.