2.Portable slit lamp adopts high-brightness, cold-light illuminator, without external power supply. 3. High-brightness LED, cold-light illuminator, its brightness up to 30000 LUX, service life more than 50000 hours. 4. Sharp slit, the width can be adjusted continuously. 5. Telescopic forehead-rest, easier to observe and adjust the diopter. 6. Easier to adjust the magnification by rotating objective lens. 7. Small and light, only 700g including battery. 8. Full power supplied by battery can drive the slit lamp for 5-6 hours.