Product dimensions: 10(H) x 6.5(W) x 2.5(D) cm / 3.9(H) x 2.5(W) x 1(D) inches. The Portable Digital Breath Alcohol Tester takes a reading in less than five seconds and can sound an alarm at a preset level. This alcohol tester includes five blowing tubes for breath sampling (drinking straws work just as well) and a user manual with operating instructions for the digital display. Features: Range: 0.00-0.19%BAC & 0.0-1.9 g/l Accuracy of 0.01%BAC Digital LCD display with LED backlight Quick Response and resume 10 second Auto power off / 2 seconds manual shutdown Requires 2 x AAA batteries (not included). <b>Please note:</b> The readings from this blood alcohol level tester, if used and calibrated as instructed, should provide an indicative guide to the level of alcohol in your body. No testing device is completely foolproof and inaccurate readings can occur due to user err