For larger mobile cell phone jammer devices, directional array antennas are used to shield significantly increased signals, thereby shielding 5 to 30 m within the range of the mobile phone according to various signals (may depend on the signal strength of the base station). The outside world has been covered, covering all mobile phone types of communication equipment and masks. Effective shielding of GSM / CDMA / DCS / WCDMA / LTE / WIFI) frequency band. Built-in aluminum alloy radiator, the equipment has good short-term stability. We use foreign advanced technology and chips, soft-start circuit design and high integration. Downlink interference from overclocking cell phone jammers only does not interfere with the base station. It is better to use multiple independent shielding segments. Smart remote control or manual mask with effective range of 5M-30 meters (depending on the signal status of the operator network), mechanical switch. It is recommended to use 3-4 hours of working time. The interference fringes can be expanded according to user needs. The main solution for mobile jammers-companies and other government agencies need a place to hold confidential meetings.