Mosquito-killing racket, also known as electronic mosquito-killing racket and electronic mosquito-catching racket, is a kind of tennis racket or badminton racket. The earliest prototype of mosquito killing racket was invented by Taiwan inventor Xu Hongzhi in 1988 and applied for a patent on August 30, 1988. Then Gan Hancheng, an inventor in Nanjing, Jiangsu Province, applied for a patent in China in 1991. Since then, a variety of improved models and brands have emerged, so far, there have been a variety of more safety-oriented or more efficient mosquito killer racket can be used. In 1996, Tsao-i Shih, a Taiwanese, registered mosquito killer pats in the United States Patent Office. (Data from the network) The most common faults of mosquito killing racket are: 1. Poor contact of key switch. 2. Capacitance breakdown of voltage doubling rectifier circuit. 3. Triode damage of boost circuit. 4. Short circuit and leakage of high voltage network. 5. Battery failure.