This is a combination router and link extender. They can be used in addition to your router, but I think the recommended way is to replace your existing router with the base unit. The extender "satellite" unit that's included can then be placed somewhere else in your house to extend the range of your WiFi. If your existing router covers your whole house just fine, then you probably don't need this. If you've got some areas where you can't get a signal, then this would definitely help fix that.