Expertise: The Otoscope is designed to examine earwax, infection, tympanic membrane, external auditory canal to diagnose outer and middle ear diseases. This otoscope can be used not only to observe the human ear, but also to observe the pet ear features: bright LED and 3x zoom increase the field of view, which helps to observe the physical condition of the ear in full spectrum. Illumination: Using optical fiber total reflection, enhanced XHL xenon-halogen technology and LED technology, the light path and observation light tend to trend, increasing the field of view. Powered by 2 AA batteries not included. EASY TO USE: Includes 8 range caps, 2 each, 2.4mm 3mm 4mm 5mm diameter, suitable for all ages. The real ear simulation experiment designed by the hat, even if you don't have enough experience, you don't have to worry about hurting your ears. PREMIUM QUALITY: Made of high quality metal and ABS material, it is sturdy and durable for long time use. Well organized in a hard box with ABS material. Great for home, clinic, medical school, veterinarian and more