Beijing Tianzheng Science and Technology Development Co., Ltd. are a science and technology enterprises that includes research and development, production and sales and trade, registered in the national park of Zhongguancun Fengtai Science Park. We wine the high-tech enterprises identified. R & D mainly products are  Anti- eavesdropping equipment, anti-candid camera, mobile phone jammer, fax encryptor, mobile phone encryptor, Data fileencryption, Medical equipment, and electric-stimulator