Wi-Fi intercoms allow two-way communication using your home or business Wi-Fi router. Just like any other device you connect to your Wi-Fi network, you simply select the name of your network and enter its password. Then, as long as you have a good Wi-Fi signal to the intercom, you have wireless communication. 

If you have door or gate that doesn't have good coverage from your network, then you can use Wi-Fi extenders to get a good signal there. These extenders can reach ranges of miles under the right conditions.