The water provides a water
signal generating device. With the water
signal generating device adopted, a power source is not required, and a
signal generating unit can be powered through utilizing water
mechanical energy. The water signal generating device includes a
contact type generator made of a flexible material and a signal
generating unit; and a wavy
electrode layer and a friction layer of the
contact type generator can contact with and leave away from each other under the
impact of the
mechanical energy of water, and contact charges can be generated at the surfaces of the wavy
electrode layer and the friction layer, so that electric signals can be generated between an
electrode layer arranged on the friction layer and the wavy electrode layer, wherein the electric signals are adopted as a power source of the signal
generating unit so as to drive a signal generating component in the signal generating unit to emit light signals or
wireless signals. According to the
underwater signal generating device, a
static electricity friction generator can be integrated on the
contact type generator, so that the
static electricity friction energy of a liquid-
solid interface and the
mechanical energy of water wave slapping can be utilized at the same time. The signal generating device can be integrated on a lifesaving device such as a life jacket, so that a body floating on water can automatically send out distress signals.