... :1.This product is a alcohol tester designed for iPhone, it's small, exquisite and delicate design, ... to Iphone , then unlock Iphone, then press switch of tester for 2-3 seconds, at the same time LCD screen will ... and exhale into sensor for 3 to 5 seconds , after finishing Countdown ,display screen will show the ... or 0.8g/l) High quality Digital LCD Breath Alcohol Tester for iPhone 4 4S iPad Breathalyzer