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Keeps you away from noise or disturbance of unexpected cellular phone calls. It can paralyze cellular phone signals within an effective area. And all the specified frequency bands will be blocked simultaneously. It can be applied at meeting room, conference room, museum, gallery, theater, concert hall, church, temple, restaurant, classroom, training center, factory, bank, train, and bus, for some locations of special purpose such as hospital, and gas station. It is easy to install and operate the device. No adjustment is needed. Manufacturer Specifications4-channel type can efficiently provide jammer for mobile signals from CDMA, GSM, DCS, and PHSIt only jammer / isolate the signals from mobile phone and does not affect the normal operation of other electronic devicesGenerally, best jammer / isolate situation is place more than 200 meters away from the base stationSwitching on, it can work stably for long-time