Www.wirelessphonejammer.com welcome to beijing signal knight technology and trade company ltd signal knight company was established in 2005, and based in beijing city. signal knight is a professional enterprise integrating signal shielding, jamming and magnifying products design, development, production and sales into a whole body. meanwhile, signal knight is one of partners of china ministry of national defense and china ministry of state security, and also acquired the certification of the national ministry of public security. signal knight's principle business is engaged in national security products, such as signal shielding, signal jamming, signal boosting, signal amplifying devices; anti-wiretapping devices, anti-hidden camera, bug detectors, spy camera scanners and relevant products. fine workmanship, best quality, competitive price and best after-sale services are what we are proud of. with the development of three years, signal knight has become a trustworthy supplier of the signal shielding, jamming and magnifying products in china, and some products exported to the united states, the united kingdom, the middle east, africa, and other countries and regions. we have our own specialists to design different products to meet market demands, such as we can offer different bandwidths mobile phone signal jamming devices relay on different countries' standard. we sincerely welcome friends at home and abroad to contact us and establish business relationship with us