MODEL NO : 2X 4K TELE Product Highlights Large in its diameter,as more light is able to enter the camera, this lens greatly minimizes any drop in image quality compared to other add-on conversion lenses The newly designed mount attachment fits the design of dual lens smartphone cameras The vice-type locking system allows easy and safe attachment to various devices.The rubber pad and locking screw will prevent accidental falls off The 37mm thread allows the use of photographic filters for creative photography.   WARRANTY 1 YEAR