This is a Western Digital External Hard Drive. It is configured for Windows but would probably work with a Mac. All my data has been removed but the original documentation remains on the drive itself plus some utility tools.
It is a 500GB spinning disk drive. It is externally powered. There is a USB A to something lead (not sure what the connection is).
Part of the case seems to have warped so it has come slightly away at one corner. However the drive is working fine.