NEEWER 8X Zoom Phone Optical Telescope For Samsung Galaxy Grand Duos i9082 With Case Detachable Design: Easy to be screwed on to and removed off from the case, and convenient to carry. Main Material: Plastic The design to run of rays effectively avoid the contortion image, and makes the wide angle, the larger luminousflux, the higher visual acutenss, good for color reduction, which makes the high quality of photography. Can be used for watching match, concert, travel, animal observes fans, newspaper-man shoots remotely, port dispatcher of railway, traffic administrative department to collect evidence, public security institutions to enforce the law and collect evidence etc.