Clear, digital image for live view and image capture -- great for patient and student education, patient record documentation and supporting information for referrals. Ability to focus and fine tune view. Insufflation port for pneumatic otoscopy. Works with all existing Welch Allyn 3.5V power sources (handles and wall transformer). Plug and play -- no special software necessary (requires computer running Windows XP Service Pack 2.0 or higher and an available USB 2.0 port)