What do you think a GPS device could do for us? Yes, it is very helpful in navigation by tracking and correcting our locations. But it is also dangerous for the same reason--- easily to track our locations, which may let bad guys to trace us conveniently, all they need to do is to put a GPS device in our cars. How to protect us? GPS jammer is the answer. After long time researching, we have found that if we use a device to issue a stronger signal than the GPS signal in the same frequency, the GPS signal will be covered and hidden, and it won't be received by any GPS device. In this case, all GPS devices in its working range will be out of service. That is the GPS jammer. More over, after we turn the GPS jammer off, all GPS devices will come back to work again, the jammer will not do any harm to the GPS devices. That is really a good news to us, whenever we suspect that we were traced by GPS device, we just turn on a GPS jammer, and we are safe. That is very convenient, when we don't need it, we just turn it off. GPS jammer are more and more popular in our lives now. GPS jammer also has another name-- GPS blocker. To know more about the GPS jammer, let's start from a wonderful GPS jammer, the High Power Portable GPS and Mobile Phone (CDMA GSM DCS PCS 3G) Jammer, model number S802002. If you are looking for a mobile phone jammer, what's kind of function you want to have? Powerful and portable device, mobile phone and GPS shielding, attractive appearance, which aspect is important to you? If a jammer includes all of these features, do you want to have a try? This is a powerful and portable GPS and mobile phone jammer. It can block the signals of CDMA (851MHz-894MHz), GSM (925MHz-960MHz), DCS (1805MHz-1880MHz) and PCS (1930MHz- 1990MHz), 3G (2110MHz-2180MHz), GPS (1500-1600 MHz). The anti GPS tracking device can jam the GPS signal to protect your important event and you can enjoy your communication in your car. The jamming range radius for GPS is 15-20 meters and for mobile phone is 5-10 meters. With DC4.2V/4800mA/h Ni-ion battery, the continuous using time is around 90 minutes. You can charge in any place with AC charger and car charger. From all these details, you will see that it is really a good GPS signal jammer. This High Power Portable GPS and Mobile Phone (CDMA GSM DCS PCS 3G) Jammer helps you to keep a safe and peaceful life. If you want to enjoy more choice, please click the jammers and you will be satisfied. If you want to know more, please refer to the product features and specifications. Below is Technical Specification of this GPS signal jammer: Power: CDMA: 25dbm GSM25dbm DCS: 25dbm or PCS:25dbm GPS: 23dbm 3G:23dbm Frequency: CDMA(851MHz-894MHz) GSM(925MHz-960MHz) DCS(1805MHZ-1880MHZ and PCS(1930MHZ-1990MHZ) 3G(2110MHZ-2180MHZ) GPS: 1500ï¼1600MHZ Automatic power switching power supply: 50 / 60 Hz / AC 100 ~ 240V transmitting to DC12V Jamming range: Radius 15-20M for GPS, Radius 5-10M for Mobile Phone(depend on cell phone signal) Battery: Ni- ion battery DC4.2V/4800mA/h Continue using time: around 90 minute Size: L110 x W62 x H30 mm Total output power: 1200mW Weight: 300g