The cell phone jammer is a shielding signal device that can effectively shield all communications such as CDMA, GSM (China Mobile, China Unicom), SCDMA, DCS (1800MHz), PCS (1900MHz), PHS, 3G mobile phone signals, WIFi and 4G mobile phone signals Signal.

It only shields the mobile phone signal and does not affect the normal operation of other electronic devices
It only shields the signal of mobile phones in the examination room, and does not interfere with mobile phones outside the examination room, let alone the base station
Only shield the downlink frequency of the transmitting base station without affecting the uplink frequency
Green and environmentally friendly, the strength of the electromagnetic field is far below the national standard, and has no effect on the human body
The operation is simple, the antenna is installed correctly, and it can run automatically when the power is turned on