... for more light output, less glare.2. 2.5 x magnification3. Disposable Specula: 2.5mm and 4. ... Insufflation Port: view tympanic membrane using an insufflator bulb.5. Smart design, convenient for mobile diagnosis.6. OT8C ... , ±3D, ±4D, ±6D, ±8D, ±10D, ±15D, ±20D.5. Aperture wheel: red-free filter, Large spot, small spot, hemispot.Technical Specification ... : GB9706.1, internal power equipment Diagnostic Set