SK-5 cellular jammer is the new release information security product of cellular jammer. The principle of cellular phone jammer is sending the disturbance signal that is the same frequency to the downlink to the cell phone base station. Cellular jammer blocks the logical signal channel like GSM, CDMA, 3G, PHS, DCS, GPS, Wireless Video, etc. In the efficient jamming area the cellular phones can not be dialed, which display “Not in service zoon.” In coming calls are blocked as if the cellular phones were off. Beijing Signal Knight is a professional cellular jammer manufacturer; we can design and develop different bandwidths frequency cellular jammers for different country clients’ demands. The SK-5 cellular jammer is now a necessity for law enforcement, privacy protection and the military to interrupt communications by criminals and terrorists.