Install and use 6 bands jammer device
6 Bands Handheld Jammer for GSM 3G 4G WIFI GPS
If you're still struggling with the noisy ringing of the phone. Or worry about the fact that GPS can reveal your privacy. Or worry about the safety of wireless networks. Then this gsm jammer will be your best choice. This device has a very convenient single frequency switch. You can choose to open or close a frequency band as needed. With good heat dissipation system, it can work for a long time. Can block the main mobile phone band and WIFI and GPS signals. As video demonstrates, we need to install the antenna before turning on the switch. Starting a jamming device without an antenna is likely to cause damage to the device. After completing the above steps, you can turn on the power switch and select the frequency band that needs to be disturbed.