Shielding box, made by metal, is a common test equipment for preventing the leakage of electromagnetic wave outwards or inwards.

Comparing to the large-volume shielding rooms, which are common in the labs, shielding boxes are more welcome on the production floors due to small volume. 

Shielding boxes are widely used in the test of different communication standards: WiFi, LTE, Bluetooth, GSM, CDMA, WCDMA, WiMAX, RFID, Zigbee, etc. It is common for the board-level or assembly test of mobile phones, wireless access points, wireless routers, Bluetooth headsets, car remotes, walkie-talkie, TPMS, etc.