1、Designed for replacing the virtual keyboard on the gimbal, allows you to control it without watching the operation panel. 2、The electroplated surface is comfortable and colorfast, concave design on the center is anti-skid to use and provides you 360 degree flexible rotation. 3、The button controller has high sensitivity which ensures quick response, makes the rotation of lens more stable and smooth. 4、With good quality pad on the bottom, can be attached on phone screen firmly. Easy to use, just stick it in the controlling area of virtual keyboard of smart phones. 5、Lightweight and portable, easy to carry with you. With a storage case that can remove the dust on the bottom of the button controller. Features: Designed for replacing the virtual keyboard on the gimbal, allows you to control it without watching the operation panel. The electroplated surface is comfortable and colorfast, concave design on the center is anti-skid to use and provides you 360 degree flexible rotation. The button controller has high sensitivity which ensures quick response, makes the rotation of lens more stable and smooth. With good quality pad on the bottom, can be attached on phone screen firmly. Easy to use, just stick it in the controlling area of virtual keyboard of smart phones. Lightweight and portable, easy to carry with you. With a storage case that can remove the dust on the bottom of the button controller. Specification: Material: Metal+Rubber Color: black+silver Size: Approx. 27*27*6mm / 1.06*1.06*0.24in Package list: 1 x Button Controller