This Magnifier Fresnel mirror screen adopts optical HD zoom technology, which can enlarge HD by 3 to 4 times, effectively preventing radiation generated by mobile phone.2. Sliding design: Simple operation: the screen amplifier doubles the screen size, so you can make the most of movies and videos on your HD smartphone. Add a Bluetooth keyboard and use it to play HD... High quality materials: ABS plastic and Fresnel mirror, strong and durable, even higher definition. Raise frame adjustable angle of view. Non slip silicone pad protects and stabilizes the phone. Excellent compatible with iPhone or an Android phone, the Simple operation screen amplifier doubles the screen size, so you can make the most of movies and videos Enjoyable .