After working at home for a long time, I want to have a good dream at home. For many people, cell phone noise is a real headache. Now, we can use cell phone signal portable jammer to prevent cell phone noise and create a comfortable and quiet dream. You can use this 3G 4G CDMA GSM PHS WIFI jammer mobile phone signal, which is very convenient at home, it can protect 3G, 4G, WiFi signals separately, and will not affect the use of other signals.