Cellular signal jammer complete schematic - what is a signal jammer

Cellular signal jammer complete schematic,what is a signal jammer,Basic Info Model NO.: CPJP8 Charger: Car Charger and Charger Adapter; Dimension(Lxwxh): 240X 202X 65mm Weight: 0.8kg RF Power Output: 3.5 Watt Trademark: Necom-telecom Transport...