The handheld VHF / VHF WiFi GPS 3G 4G mobile phone signal jammer also has an optional button, so users can determine the interference frequency band according to their actual needs. VHF / VHF WiFi GPS 3G 4G mobile phone signal jammer has 6 antennas, so it can cut off CDMA, GSM, DCS, PCS, UMTS, 4G, WiFi, GPS, VHF, UHF and other signals; at the same time, it depends on signal strength and interference radius Up to 30 meters. Just like this portable optional mobile phone jammer, it also has an on-board charger, so the driver can easily use it in the car while driving. The excellent cooling fan keeps this portable phone jammer in good condition. Each channel can be opened and closed separately, can block all mobile phone networks, and can also block GPS signals.