To automatically or manually light emitters when meeting with a disaster due to falling into the sea or a lake so as to confirm a falling place for a swift rescue.

A battery 2 is provided in the specified position of a life jacket 1 with buoyancy, and a stroboscopic light 3 applying a current to the battery 2 is mounted in a required position. An emergency transmitter 5 with a manual switch or an automatic switch is mounted on a part to be the surface side when the life jacket is floating, and several emitters 6, 7 are mounted on specified parts on the surface side.