"Radio Wave Disruptor" is a device that blocks radio waves from cell phones and Wi-Fi to temporarily turn them off. In some theaters and halls it can be installed with a license from a wireless station to prevent cell phones and WiFi. Let's take a closer look at the "wifi jammer", which can be called an extended form and can only disconnect the target router.
It is also true that there is a voice that the so-called radio wave jammer is not easy to use. This is because it affects any device that falls within the effective range of the radio jammer. For example, you cannot be skillful, e.g. B. "Only use cell phones and disconnect WiFi" or "Connect WiFi used by connected parties, but only disconnect free WiFi".