BACtrack replacement mouthpieces make sharing your BACtrack 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 BACtrack, but they do make it easy and safe for testing others. Compatible with the BACtrack S35 breathalyzer.