Vodasafe Jammer Store does its best to provide our customers with the high quality devices to jam the signals of cell phone as well as frequencies of other devices.The technology of all our cell phone jammers and cell phone signal blocker made in China,our factory ahere by "quality first, the customer first, the credibility of the first" purpose to cooperate and do business with our customers,we are pleased to hear and use customers suggestions to develop some newest prison jammer per customer requirements to meet the market deman d s.we are specialized in this field for many years , it means that all our cell phone jammers for sale have the highest quality , best specifications and first class services on the market.That's why we are not afraid to provide 1 year warranty on our cell phone scramblers and mobile phone prison jamming equipment,because we are absolutely sure that these devices will be used by you without any problems.So pls contact us to get more details on possible threats and protection measures against them. Once you have a cell phone jammer in hand,it can solve the problems for tracking,protecting our privacy,avoiding to bother by cell phone,wifi,gps and ect.Our website is www.vodasafe.com