Abstract: A clamp for fixing a small electronic device on an upper end of a rectangular panel. The upper end of the panel has a horizontal top end, a front edge and a rear edge, the front and rear edges being perpendicular to the top end of the panel. The clamp includes an L-shaped assembly, an elastic module, and a base. A vertical side at the front of the L-shaped assembly engages the top end and the front edge of the panel. An elastic module fixed at a rear end of the L-shaped assembly has an arc-shaped plate bending towards the rear edge of the panel so that the L-shaped assembly will attach tightly to the top end and the front edge of the panel. The base is fixed on the L-shaped assembly and is used to fix the small electronic device. When mounting the clamp to the upper end of the panel, the upper end of the panel will slip across the arc-shaped plate and be clamped between the arc-shaped plate and the L-shaped assembly of the clamp.

Abstract: A monitor cursor controlling device provided with a signaling element, includes a cursor controlling unit, which is used for controlling a position of a cursor on a monitor of a computer, including an operating interface, generating an electrical signal in accordance with a manipulation motion performed by a user; a controller electrically connected to the operation interface, receiving and processing the electrical signal to generate a cursor controlling signal for controlling the movement of the cursor on the monitor; a signaling element electrically connected to the controller, and generating a perceivable signal for the user in response to an enabling signal generated by the controller, and a detecting memos electrically connected to the controller for receiving the cursor controlling signal to execute a cursor controlling operation, and having the controller to generate the enabling signal when at least one of a distance the cursor is moved on the monitor and a period of operation time of the device is g