Features:Keeps you away from noise or disturbance of unexpected cellular phone calls. It canparalyze cellular phone signals within an effective area. And all the specified frequencybands 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 locationsof special purpose such as hospital, and gas station. It is easy to installand operate the device. No adjustment is needed. If not well paralyze happened,please change the installation location or position or to check if any cellularcontrol stations or repeaters installed just in nearby. producing area:China payment:T/T in advance supplying capacity:100pcs/day