?Breath alcohol tester ?3 test step with LED indication -- Safety: under 0.02% BAC (0.1 mg/l BRAC) -- Caution: 0.02%~0.05% BAC (0.1~0.25 mg/l BRAC) -- Danger: over 0.05% BAC (0.25 mg/l BRAC) ?Audible alert ?Quick response and resume ?Clock with 12/24 format ?5 Alarm ?Countdown & count-up timer keep the deadline of your parking. ?Key chain ?Clock use 1 ?AG13 battery (included), alcohol tester use 2 ?AAA alkaline batteries (not included) ?Unit dimensions: 75 ?30 ?20.5 mm