DoorBird’s powerful and compact 2-Wire Ethernet & PoE Converter transmits network data and Power over Ethernet over just 2 conductors.
DoorBird™ IP I/O Door Controller
The DoorBird A1081 I/O Door Controller provides control of up to three doors or gates via the DoorBird app. Once on the network and paired with a DoorBird door station, the A1081 can be located anywhere on the project. No wires are needed to connect the A1081 and the DoorBird door station. The DoorBird I/O Door Controller can be used to create a more secure installation by eliminating the possibility of activating the gate or electric door opener by shorting wires.  Additionally, the A1081 includes two EXT terminals that can be used to send push notification alerts via the DoorBird app.  
Features
Tamper-proof control of up to three doors or gates via DoorBird™ app
Monitoring of two EXT sensors via push notification alerts
Three freely configurable (normally open, normally closed, toggle, latching) bi-stable switching relays
Supports Wi-Fi and Ethernet connection
Power via PoE or included 15V transformer