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.

4-channel type can efficiently provive jammer for mobile signals from CDMA, GSM, DCS, and PHS;
It only jammer/isolate the signals from mobile phone and does not affect the normal operation of other electronic devices;
Generally,best jammer/isolate situation is place more than 200 meters away from the Base station;
Swithching on, it can work stably for long-time;