Atmocube should be powered with 5V @ 2A USB power adapters.
Atmocube also has a PoE version, which is Power Over Ethernet IEEE 802.3at 13-W PD Type 1 complaint. If PoE is desired, make sure you have the proper version; otherwise, the device will not be able to support Power over Ethernet.
Atmocube also has a direct wiring option for building installations (24V AC/DC). If using direct wiring, please make sure you have a trained electrician handle any wiring procedures with the device to avoid causing damage.