Abstract: The flotation device with hand-operated propulsion structure comprises a hull with right and left hand cranks. The hand cranks are each connected to rotate its own propeller so that steering is achieved by different cranking and propulsion is achieved by cranking on both manual cranks. In addition to the hull with cranks and propellers, a survival suit is provided with corresponding attachment for the securement of flotation and propulsion devices thereto.

Abstract: An electrical connector for audio devices using earphones, has the shape of a snap jack in contrast to the conventional plugs and jacks which are long and thin. The snapjack shape of the connector provides a large area of electrical contact between the plug and the jack, so that if the audio device is portable and subjected to intense vibration, the electrical connection between the plug and jack will be strong enough to withstand this vibration without introducing noise into the circuit.