Features: EVQWJN007 trackball navigation key, multi-directional multifunctional rolling ball switches, supports 360 degree freely rotation operate. Compact and portable, suitable for mobile navigation or device control. Having precise control and operate experience (special accessories, equipment compatibility needs to be confirmed). The trackball design provides smooth and accurate cursors control, making it more convenient for users to browse, select, and input. Quality, ensuring good performances and response speed even after long-term use. Specifications: Component: ABS Size: approx. 2x1cm/0.79x0.39inch Model number: EVQWJN007 Applicable Model: for dedicated mobile phones Package Includes: 1Pc Multi Functional Rolling Ball Switching Key note: Usage suggestion Regular Cleaning: Ensuring optimal performances, it is recommended that the area around the trackball be cleaned regularly to prevent dust and dirt buildup from affecting operate. Attention: When using the trackball, applying appropriate pressure can improve the sensitivity and accuracy of the operate. replacement and maintenance Replacement process: First disassemble the back cover of the phone and take out the old trackball. Carefully install the new trackball into place. Make sure all connection are good before reinstalling the back cover of the phone. Maintenance suggestion: If stuck or insensitive occurs during use, you can try to disassemble and clean the trackball area, or consider replacing the trackball with a new part.