What is a GPS signal jammer? It is a commonplace talk of an old scholar. A GPS jammer is a device used to conceal one’s whereabouts or to block the hidden GPS tracking signal by sending radio signals with the same frequency as the GPS device. Once this occurs, the GPS device is unable to determine its position due to interference. Are you confused about where to buy gps jammer? Need to know more information about such jammer kit, welcome here www.jammerall.com and we will offer you surprises about the jammer product here.