They supports up to 3 sensors that can be easily attached through standard Cat5 Ethernet cable.

The mPort features built-in Wi-Fi and Ethernet to attach the sensors to the IP network.

Once connected, the mFi controller software enables complete control over all connected sensors. 

http://dl.ubnt.com/datasheets/mfi/mFi_Datasheet_V10_6-28-12.pdf

http://dl.ubnt.com/guides/mfi/mFi-CS_QSG_V10_4-25-12.pdf