A portable heat transfer apparatus comprises a mixture formingsupply device for producing a mixture of fuel gas and air, a heating unit including a heat collection casing, and a burner installed in the casing and formed with a combustion chamber having a flat surface. While one function is to fix a foot pedal relative to a keyboard stand, the foot pedal arrestor can also be applied to any user operated device associated with a broad spectrum of applications. The control device further controls the sensor sub-system to select signals for processing to identify the proximity and direction of movement of the object relative to the crane. The controller, which is associated with the sensor, is operable to process the sensed accelerative phenomena as a function of at least one accelerative event characteristic. Also, the power unit preferably includes a vacuum pump or other power assist unit coupled to the towed vehicle power brake system unit, to enable use of that system when the brake pedal is pulled down by the cable during the remotely controlled braking process. The second member is formed of a material with a density lower than a material of the first member.