The Lifeloc FC5 HornetTM tests for the presence of alcohol without the need for mouthpieces or special attachments. Three test modes ensure full user control and safety in screening cooperative or uncooperative subjects, ambient air and open containers.Features : 3 testing modes for easy passive testing LCD screen with full prompts and visual alerts Icon driven software that easily guides users through testing process Audible alerts Rapid and repeatable testing Constant battery indicator while device is on No mouthpieces required.