Condition: 100% Brand New Item Type: Ophthalmoscope Material: ABS Diopter Range: -20d ~+20D Show: 90% or higher Battery: 2pcs AA batteries (Not included) Principle of coaxial parallel light Optical glass lens, five different spot diopter range: -20d ~+20D LCD screen, handle brightness adjustable reducibility, indicating 90% Stable light effect, low power consumption LED light with constant current and voltage regulation built into the handle, with a service life of up to 20,000 hours 1The electronic display of the handle shows the battery power and the strength of the light source. 2Toggle the rebound switch, toggle upward, the light source becomes brighter and brighter; As you scroll down, the light decreases in brightness until the power is turned off. 3Suitable for eye examination, principle of coaxial parallel light, optical glass lens, five different light spots. 4Diopter range: ?20d ~+20D; Strong reducibility, indicating 90%. Stable optical effect, constant current voltage IC built in handle. 5Low power LED light, service life up to 20,000 hours, long service time.1 x Ophthalmoscope Handle1 x Ophthalmoscope Lens1 x Manual