A coupler is disclosed that employs hall-effect sensing technology. The landing gear strut has a first end arranged to be pivotally coupled to an aircraft and a second end pivotally coupled to the bogie beam. As G2A activation is shown to be involved in a variety of physiological processes including cell proliferation, autoimmunity and inflammation, methods which modulate its activity have a variety of diagnostic and therapeutic applications. When a temperature of the electronic device exceeds the preset temperature, the detecting voltage signal is below the reference temperature signal, and the comparison circuit outputs a control signal to close the switching circuit. The method also includes choosing from said plurality of groups of Megas a final set of Mega groups having a reduced total fee. The handle can be firmly locked to the modularized casing without being loosened and dislocated, and the engaging device can be rapidly released from the positioning hole, while most of a volume of the handle will not protrude out of the modularized casing.