The main purpose of this device is to investigate all forms of electromagnetic radiation and sound unintentionally emitted from electronics, including consumer laptops and desktops, routers, servers, "smart" appliances, etc. It should be of concern that most modern CPUs run at frequencies between 2-3 gHz while wifi and bluetooth operate in the same range, near 2.4 GHz: if an antenna circuit is available, the CPU could potentially transmit encryption keys and other private data. IR ports are also of concern.