A portable breath analyzer which offers latest in cutting-edge breath alcohol sensing technology. This can be operated with a mouthpiece (included in package) for single use, or you can blow directly into the unit. If the “Flo” message was displayed while in use, this warns “insufficient airflow”, and you are not blowing enough. The sensor can be changed easily. Has a range of 0.00 to 0.40% BAC (Blood Alcohol Content) or Hi/Lo range. Requires recalibration on every 6 to 12 months by professional service.