Components: light bulb (LED), handle, earmuffs (4 specifications, 2 sets each) 2.4mm 3mm 4mm 5mm Power Supply: 2 AA batteries(Not included batteries) Directly observe the proliferation of endothelial cells in the ear canal, the color and amount of earwax, and whether there are polyps in the ear canal to assess the severity of ear canal diseases and choose treatment methods based on the test results. High brightness allows the inspection to observe the of tissues The observation system uses a 3x magnification lens to provide a wide-angle field of view and can be rotated. 2.4mm 3mm 4mm 5mm Four diameter earmuffs are suitable for ear canals of different sizes Color: Black Material: ABS+Copper Package Contents: 1 * Otoscope 4 pairs * earmuffs 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.