The TANlock 3 is powered via PoE (Power-over-Ethernet).
If a PoE port is already available in your server rack, simply connect the TANlock 3 to a PoE network port.
In case you do not have any PoE ports available, a PoE injector can be used as well.
The TANlock Zero, on the other hand, is powered by an external power source connected to the TANlock Zero through open cables (e.g. Controller:Unit, ENA or BNA).