The BT Wi-fi Extender 300 extends the range and strength of your existing wireless signal so you can connect all your wireless devices anywhere in your home. Using N300 Wi-Fi technology, BTs wall plug range extender works out of the box and with ALL broadband providers. The BT Wi-Fi Extender 300 is easy to setup, works perfectly with your broadband and extends the range of your Wi-Fi to connect any wireless device. Range extenders. Transfer speed: N300. Plug and play. Wireless.