This cellphone holder Fixed cellphone to an astronomical telescope easily. You can use your mobile phone to record while observing, and liberate your hands. Fixed the cellphone to telescope body. Smartphone Working Size: 55-85mm Cellphone clamp with rubber lined:no need worry about your phone is scratched or damaged Color: red + black Dovetail Plate Material: metal Phone Clip Material: ABS Plastic Package Contents: 1 x Dovetail Plate 1 x Mobile phone clamp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.