A top quality, no installation required antenna that will increase your Franklin Wireless CDU-680 3G and 4G signal strength while removing most EM radiation away from you and into the antenna. Simply plug the included cable into your Franklin Wireless CDU-680 antenna port and enjoy the increased signal and improved data transfer rate. This signal improvement system is made for the Franklin Wireless CDU-680 and comes with a total cable length of at least fifteen feet. The adapter is easily replaceable so that if you change your device you won't have to purchase this complete set again. No installation required. One year limited warranty included.