The BACtrack S80 Pro is a professional breathalyzer that quickly estimates a user's blood alcohol content (BAC). It is approved as an alcohol screening device for use by professional groups including law enforcement. But because of its small size and affordability, it is also a top choice for a personal breathalyzer use whenever a high level of accuracy is required. Owning a breathalyzer is a great way to understand how drinking alcohol affects your Blood Alcohol Content (BAC). The legal driving limit is now 0.08oC in all U.S. states. Make sure you are well below the limit and help keep your friends and family safe by owning and using a breathalyzer. To use, simply insert a mouthpiece and blow for 5 seconds. The BACtrack S80 Pro uses highly accurate XtendTM fuel cell sensor technology to analyze the breath sample and provide a BAC estimate in approximately five seconds. The BACtrack S80 is the fastest and most accurate BACtrack Breathalyzer available. The BACtrack S80 has been tested by the Department of Transportation and meets their requirements for a breath alcohol screening device.