Wireless, computer-peripheral device

A wireless, computer-peripheral device comprising:

• a body formed to have a normal orientation with respect to a support surface and having:
• a slide at least substantially parallel in use to the support surface;
• and
• circuitry adapting the peripheral device for its operation, the circuitry including an aerial driver;
• and
• an aerial unit slidably arranged with respect to the body for movement between a retracted position and an extended use position, the aerial unit having:
• a first member formed complementarily with the slide for sliding along it between the two positions;
• a pivotal connection on the first member;
• a second member connected to the first member via the pivotal connection and movable with the first member, the second member being substantially aligned with the slide in the retracted position of the aerial unit;
• a spring at the pivotal connection and acting between the first member and the second member for lifting the second member to a position substantially perpendicular to the slide when the first member is in the extended position;
• and
• an aerial element in the second member remote from the first member, the aerial element being flexibly connected to the aerial driver and spaced from the support surface when the second member is lifted by its spring;
• wherein the slide is a slot having sides and over-hung ends, the first member has a major portion with a width to slide in the slot and a minor portion with a reduced width that is able to protrude between the over-hung ends in an extended position of the aerial unit, and the second member has the reduced width whereby it can pass between the overhung ends.