The iBreath is an iPod add on that includes both an Alcohol Breathalyzer and an Integrated FM Wireless Transmitter.
From David Steele:
Party on! The ultimate iPod accessory lets you party all night long and then makes sure you get home safely.
The clever & innovative product is called the iBreath® and it's an iPod accessory that includes a fully functioning alcohol breathalyzer and an iPod FM transmitter that transmits your iPod tunes to any FM tuner.
Just fold out the BAC blow wand and exhale into it for a full 5 seconds. 5 seconds later, this jail-saving gizmo let's you know if you're safe to drive. It even houses a timer that can be set from 1 minute up to 4 hours in order to remind you when it's time for the next test.