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1. Kellner Eyepiece lens design (three optical glasses structure). You can use it for observing the moon , the eclipse of the sun(with a solar filter) , for observing the beautiful scenery in the daytime or others. 2. Universal —It is compatible with a variety of phones whose's width range from 2.2" to 3.9" such as iphone 4, 4s, 5, 5s, 6, 6s, 6plus, Samsung Galaxy S5, S4, S3, S2, Moto Etc. 3. Super easy to use —a. put the inside the clamps. b. Align the center of camera with the center of hole of the eyepiece. Lock the clamps with the knob. c. Put it into the telescope the same as a eyepiece. Phone is well protected by High density EVA pads and nothing contacts your phone's screen. 4. Focal length 10mm: High-power watch the scenery, bright celestial observations, nebula and so on. 45 degree view angle 5. Durable Material: The body is made of high strength Plastic. 6. Compact and light weight: 4.4"x3.4"x2.25"(LWH), 2.34oz.