The Dygma Raise keyboard uses 5 Volts and up to 0.9 Amps. Its maximum power consumption is 4.5 Watts.
This is also the power and voltage requirement of the standard USB 3.0 port.
The Raise is made to work with all USB ports that comply with this standard of 5V and 0.9A and will always work with a USB with a supply of 4.5W.
Power (in Watts) is calculated multiplying voltage (in Volts) by the current (in Amps), so 5 x 0.9 = 4.5 W.