3G/CDMA/GSM jammers are cell phone jammers which can block all mobile phones and similar devices in a specified radius. GPS jammers are designed to break you free from GPS tracking and tracing devices of all kinds. GSM/GPS jammers are the perfect combination of the two previous jamming devices, especially for you to have both of them in one piece. UHF/VHF/LoJack jammers are blockers which can grant you with additional protection from rarely (but still) used surveillance and tracking devices. And Wi-Fi/Bluetooth jammers are your best friend to deal with wireless video- and audio recording devices of the appropriate frequencies.