Small, exquisite and delicate; Foldable ring design; It's so easy to carry; Adopts new gas detection technology, which can detect the more actual alcohol content of gas; LCD Digital display and color backlight screen can make detection more ocular and more efficient; Unique detector can effectively identify cigarettes, coke, coffee smells and prevent non alcohol gas to interface the detecting result; With voice alarm function, when alcohol content is excess, the buzzer will alarm automatically alert; It powered by phone, just connect it to phone for use; No need to use blowpipe, just blow into air hole, which is healthy and clean