(1)Quick response and resume.
(2)Real time.
(3)Count-up & countdown timer.
(4)Liquid crystal display method.
(5)Auto power off.
(6)Use two 1.5V "AAA" alkaline batterries(not Included).
(7)Size: 95x36x18mm.

With more and more cars in faimilies, more and more relatives and friends are driving cars, do you worry about their safety while driving? Send them with such Breath alcohol testers with key ring as gifts, remind them not drive if in state of intoxication from alcohol.