The Hologram Nova is a cellular modem purpose-built for global IoT development with single board computer compatibility and Hologram software tools. For more information about the Nova, please refer to this page.
For single board linux devices (Raspberry Pi, Beaglebone, etc.) we recommend at least 2.4 Amps. We also recommend a power supply that maintains a voltage 4.7V to the USB to prevent any brownouts or blackouts.