A fuel feed apparatus is accommodated in a fuel tank. The apparatus includes a buckle and a lap anchor. The torque and power characteristics of each of the starter-alternator devices, while not being adapted to the first heat engine, are adapted to a second heat engine having a second cubic capacity which is less than or equal to a second predetermined value equal to a fraction of the first predetermined value. An antenna module is coupled with the housing, and the antenna module comprises an antenna coil locating on the first surface of the non-metal body. This knife finds its application in the fields of, for example, mountain climbing, pot-holing, deep-sea fishing, water and aerial sports.