The function of the signal blocker is to intentionally block or interfere, which essentially "blocks" the wireless signal to interrupt the communication between the sending device and the receiving device. Traditionally, blockades have been used to disrupt enemy communications on the battlefield. signal jammer emit noise at the same frequency, essentially overwhelming the receiver's ability to understand the message being sent. In some countries, Wi-Fi signal jammers are used as sensor devices to block harmful radio signals from neighboring countries from being received by their citizens. Other types of interference block signals are received without using noise, so the blocked party will not realize that the interference equipment is being used.
