Net/X Wi-Fi thermostats support WEP 40/64-bit ASCII, WEP 40/64-bit Hex, WEP 104/128-bit ASCII, WEP 104/128-bit Hex, WPA-PSK, and WPA2-PSK2. It is important to match the thermostat's Wi-Fi security type with that of your wireless network, otherwise you will not be able to connect the thermostat to your network. It is highly recommended to use either WPA or WPA2 security on your network due to better security.