A top quality dual antenna system that will reduce your exposure to harmful electromagnetic radiations if used properly with your Sierra Wireless Sprint 3G/4G USB 250U 3G and 4G signal strength while removing most EM radiation away from you and into the antenna. Simply plug the included cable into your Sierra Wireless Sprint 3G/4G USB 250U antenna port and enjoy the increased signal and improved data transfer rate. This signal improvement system is made for the Sierra Wireless Sprint 3G/4G USB 250U but should you change device in the future, you'll be able to simply replace the included adapter without having to purchase the complete system again. Total cable length of at least fifteen feet included. Patent pending. One year limited warranty included.