The TP-Link N300 WiFi Wireless Range Extender TL-WA855RE is a white external device that amplifies the signal of a wireless router, allowing for a stronger and more reliable WiFi connection in areas where the original signal may be weak. With a maximum LAN data rate of 300 Mbps and a corresponding wireless data rate, this extender is designed for high-speed connectivity. Easy to set up, it is a practical solution for improving internet coverage and strength in a home or office environment.