| 摘要 |
The present invention relates to a life jacket and an X-band for workers, capable of automatic switching. The present invention provides an LED light emitting device in the form of a safety mark &thgr;, embedded on one end surface of the back and the front of the life jacket and the X-band, and sound sensors embedded on the safety mark LED light emitting device at the front and the back, respectively, thereby detecting bright and dark automatically, operating the LED light emitting device automatically, and turning the function off automatically when the workers come to a brighter area. |
