This is a very nice FULL size clinical otoscope with our largest diameter optical quality glass lens. Handle and switch are light but very sturdy construction from an aircraft quality aluminum metal. The amount of light produced and clarity of vision is second to none. Our otoscope uses a proprietary LED module built on a circuit board with a DC/DC boost converter and voltage regulation and will probably last a lifetime. Even if the LED ever fails our replacements are only $5 not the usual $25 you would pay for a name brand halogen bulb. The otoscope is powered by 2 C cell batteries which should provide extremely long lasting power since it is LED. We have had customers tell us in our smaller 4th generation pocket pro model battery life (one AA) has lasted over a year with regular use. The battery savings compared to any other full sized otoscope should be substantial over time . If you are a medical person and have used otoscopes in the past and have realistic expectations on what you are normally able to see inside the ear you will be especially impressed with this otoscope. Purchase this along with one of the expensive brand name models and compare. You will be pleasantly surprised how well this one performs. Our goal is to provide more affordable medical diagnostics and stand behind the products we sell. If you have any problem at all we will always make things right no matter how long you have owned our products.