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High Power GPS-WIFI-Cell Phone Signal Jammer with Signal Band Control Swith This newly designed model difference from others is its Band Control Swith Function. It can block the the cell phone,Website:http://www.jammerwill.com, wifi and gps signal at the same time, but when you just want want to block the cell phone's signal, but not bloking the wifi and gps signal, you can use the swith on the item's side to control that. Turn off the wifi and gps, then it will just stop the phone's signal. What functions you need, what functions you don't need, now you can use the swith to make what you need