... so easy to carry Introduction This product is a alcohol tester designed for iPod touch5,iPhone5,iPad4,iPad mini, ... , then press switch of tester for a long time till Tester alert short buzzing, at the same time LCD screen ... .Avoiding to use in a strong wind or at the most polluted environment5.pls don't blow ... the safety of yourself and others pls. alcohol tester with light FOR iphone5 safety for driver