Function： 1) Breath alcohol tester 2) 3 test step with LED indication 3) Safety: under 0.02% BAC (0.1 mg/L BRAC) 4) Caution: 0.02%~0.05% BAC (0.1~0.25 mg/L BRAC) 5) Danger: over 0.05% BRAC (0.25 mg/L BRAC) 6) Audible alert 7) Quick response and resume 8) Clock with 12/24 formats 9) 5 alarm 10) Countdown & count-up timer keep the deadline of your parking 11) Clock uses 1 x AG13 battery (included), alcohol tester uses 2 x AAA alkaline batteries (not included)