Cerveza Corona has created the first device that according to the alcohol rate in the blood, released or not the car keys. We equipped the valet parking employees of the main bars and restaurants with the device; so when the driver leaves the place, has to blow into the device to get the result: if the alcohol rate was below the limit, the device release the keys along with a discount coupon for your next visit, if your alcohol rate was above the limit, the device remains closed with the car keys inside and Corona will provided a Corona driver to take you home safely.