The Diagnostix 5410L Portable Diagnostic Set includes an Otoscope and a Coax Ophthalmoscope. The Otoscope features a 3.5V Otoscope head and plug-in rechargeable Li-ion battery. Its head uses fiber optic light transmission, optical glass for 3X magnification and a bidirectional swivel lens. The Coax Ophthalmoscope features a high performance aspherical condenser lens that reduces corneal reflection. Its ergonomic design and thumb rest improves stability and allows for all functions to be controlled with one finger. This device is dust proof and makes use of 6 apertures (Slit, Fixation, Large, Small, Micro Spot, and Half Moon) and 3 filters (Red Free, Cobalt, and Polarizing).