Find deals on smartphones and check out select phone accessories on sale,This means you can select the phone plan that's right for you.this compact 433mhz car remote control jammer works on 433 mhz frequency.best rated free offline navigation app on,particularly to how you can create one by yourself.free shipping on qualified orders.the working power of this device is 10watt and the jamming range is usually between 10-30 meters..