When used solely to drive the hard disk, it can deliver up to 10 hours of longevity in a specific use case (HD streaming to one device over a single 2.4GHz band).
The Wireless Pro also comes with a massive 6,400mAh battery which can be used as a power bank. You will obviously need to have compatible devices to make the most of it. The drive offers 802.11ac connectivity which in theory means that you will be able to transfer files far faster. That was likely an issue with Windows rather than the device.
Sadly, we couldn't get our Windows 10 test machine to connect with the drive wirelessly, either on the 2.4GHz or 5GHz channels. That's better than the drives we tested last year and likely to be due to the higher platter density which allows more bytes to be crammed in per unit volume/area. The drive performed quite well on CrystalDiskMark, hitting 121.9MBps and 120.9MBps in read and write respectively. It's worth noting that the average drive read time stands at 8.5ms. It consumes an average of 2W in read/write mode and 0.7W when idle. The WD30NPRZ runs at 5,400RPM and is equipped with 64MB cache. The My Passport Wireless Pro uses a 15mm tall, 2.5-inch hard disk drive with a 3TB capacity (in our review model) from the WD Blue family.
