Complete instructions are included on package insert. It is recommended that you use the Medi-Scope to inspect the eyes, ears, nose and throat of family members while they are healthy, to familiarize yourself with the visual properties of healthy tissue. This will allow you to identify changes that may occur at a later date allowing you to communicate these changes to your doctor. The magnifying head piece and individual attachments, except the penlight, should be washed before and after each use with warm, soapy water and then wiped off with rubbing alcohol. Allow to air dry. Do not immerse the pieces in boiling water or place in dishwasher. Do not allow moisture or water to get inside penlight. Care should be taken to avoid scratching the lens of the magnifying head piece. Battery Replacement: The Medi-Scope uses 2 AAA replaceable batteries. When the light in the penlight becomes dim, replace with 2 AAA batteries. Simply unscrew the penlight, dispose of the old batteries properly, and insert new batteries.