An integrated blade cooler for electronic components comprises a blower with a radial impeller and a casing, an electric drive with a magnetic rotor and a stator, and a heatsink with heat-exchanging means and a base providing thermal contact with said electronic component and said heat-exchanging means. When writing of the new control program into the flash ROM has ended and the update of the control program in the flash ROM has been completed, the control is changed to that based on the updated control program. Portable unit allows textual, audible and visual message inputs and their selective playback based on time or other preselected textual, audible or visual stimulus. The retaining device of the truss handling apparatus engages the sloping side rafters or top of a truss.