| 摘要 |
<p>Some embodiments of the inventive subject matter may include a trackball to provide input to electronic computing device. The trackball can include and upper portion having an upper surface. The trackball can include a lower portion having a lower surface. The lower portion can be operatively connected to the upper portion, wherein the upper portion can combine with the lower portion to form a complete sphere, and wherein the upper portion can be housed inside the lower portion in a collapsed position.</p> |
