Feature:1. 2 models for option: HS-OP10S/ HS-OP10. The differences between them: HS-OP10S has simple handle. HS-OP10 has standard handle that is more handy and convenient; and adopts coaxial parallel light principle.2. 5 different apertures. 19 kinds of adjustable corrective lenses; range of lenses: -20D~+20D.3. 4000K color temperature LED bulb and XHL Xenon Halogen bulb for choosing.4. The clip with integrated on/ off switch for simple use.5. Powered by 2 AA batteries (not included), easy to install and replace batteries.6. Compact size and lightweight design for easy storage and convenient transport.7. Elaborate design and reliable quality. A classic instrument for physician.Specification:Ophthalmoscope is a classic device for ophthalmology. This device adopts a professional lens system, which makes doctors conveniently get a clear visual field for examining the interior structure of eyes, such as dioptricmedia etc.Specifications:Model: HS-OP10SMain Color: BlackMain Material: ABSIllumination: Direct IlluminationLuminance: 14 lmBulb: 106 2.5V, 0.5A; 206 3.0V, 0.08APower Supply: 2 * AA Battery (Not Included)Operate: Temperature 10~35, Humidity 30%-75%, Air Pressure 700hPa-1060hPaStorage and Transport: -20~70, Humidity 10%-90% (without condensation), Air Pressure 500hPa-1060hPaItem Size: Approx.173 * 18mm / 6.81 * 0.71inItem Weight: Approx.63g / 2.21oz Package Size: Approx.19.2 * 10 * 3.7cm / 7.56 * 3.94 * 1.46in.Package List:1 * Direct Ophthalmoscope