Unique 4 digits LCD display • Build in DSP microprocessor technology. • Warm up time : less than 20 sec. (typical). • Auto adjust / reset, with reset button • Illumination button for use in dark (Auto shut off after 10 seconds) • Power source : 1.5V Alkaline (“AA” size) x 3. and 12 VDC adapter. • Accuracy : 15% @ 0.01 % BAC • Blowing time : 4 ~ 5 sec. continuously. • Automatic switch off after 30 sec. • Removable mouthpiece, easy to clean and replace. CE approved.