A modem or a wireless router's lights blink when communicating information to a Wi-Fi device. However, as long as the Wi-Fi device can get and send data over its wireless connection with the router, this issue can be overlooked. The router's lights blink when the tool sends and gets information transmissions, demonstrating the information has been appropriately prepared and sent to either the Wi-Fi device or the modem. Sometimes, router lights keep flashing even the Wi-Fi device isn't wirelessly connected. The data keeps transmitting from the Internet—this process, known as Address Resolution Protocol. The router's lights blink at whatever point it sends or gets information, including those delivered by the ARP. As the router processes information from the ARP, its lights Flashing discontinuously. At this point, when the router processes information while a Wi-Fi device is connected, the blinking happens all the more rapidly.