Digital shield is a powerful shield2G/3G/4GThe full-system shield of the mobile phone signal sends the corresponding interference signal for different modulated signals in order to achieve the best interference effect with the use of smaller interference power. ForTD-SCDMAAndTDD-LTECan be stable synchronization with the public network base station, zero interference to the upstream. Digital shields are mainly used in school examination rooms, large-scale venues, prisons, confidential meetings and other important confidential places. And digital shields use multi-unit network mechanism, support large venues to use multiple machines at the same time stable work.