Backtrack replacement mouthpieces make sharing your Backtrack easy and sanitary. Made of hygienic plastic, they are easily removable, washable and reusable. To clean, simply drop into soapy water, rinse, and air dry. Mouthpieces do not affect the accuracy or operation of your Backtrack, but they do make it easy and safe for testing others. Compatible with the Backtrack Mobile Smartphone Breathalyzer for iPhone and Android devices.