Feature: 1. Using foreign high-definition optical lens technology, the picture in the mobile phone can be enlarged by 3 times, the picture is clearer and more vivid, the dynamic feeling is stronger, the eye fatigue is slowed down, and the myopia is effectively prevented. 2. Specially add sound amplifier to solve the problem that your mobile phone volume is not big enough, whether it is indoors, in outdoors, beach, etc. 3. The lens is an astigmatic optical Fresnel lens, which is safe, energy-saving and environmentally friendly. The speaker can be used repeatedly. 4. The product has a compact appearance, a smaller size, and is more portable, suitable for all types of mobile phones. 5. It is especially suitable for watching 3D mobile movies, and has a stronger stereo effect! It can also be used as a traditional magnifying glass. Because of its large enlarged area, it is more suitable for middle-aged and old people to read books, read newspapers, and watch news online.