This USB GPS JAMMER looks just like an ordinary U disk or cyber bank USB, yet it's very convenient to use due to its concealment! Designed with a display screen, showing you the blocked GPS frequencies. See more info at: http://www.jammer4uk.com/2017-usb-gps-jammer-usb-gps-l1l2-blocker-p-61.htmlCan block common GPS frequencies: GPS L1: 1500-1600Mhz, GPS L2: 1220-1230Mhz!