A device minute is the billing unit. Device minutes are a measurement of the time it takes (in minutes) to install, execute, and uninstall your app and tests on every device you have selected for your test run. The unit price is constant regardless of the device, test, or application type. Device minutes are only billed for tests that complete without any device or system errors. Similarly, for Remote Access sessions, device minutes are measured from the time it takes to prepare a device to your specification to completely removing any apps and data you placed on the device.
You can dynamically grow and shrink your usage according to your business needs without any upper limits or up-front commitments.