iPhone support
WD says the exFAT format works with compatible iOS devices but names no iPhone model. Apple warns that external hard drives often need their own power when connected to an iPhone.
WD My Passport portable hard drive with USB-C, 5TB
A 5TB portable hard drive with its own USB-C port and a C-to-C cable. That is more than the largest internal drive Apple offers on a MacBook Air, 4TB on the M5 models.
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5TB in blue, SKU WDBGES0050BBL-WESN, the native USB-C version with a USB-C to USB-C cable in the box. The same 5TB drive also comes in black, red and teal.
5TB in blue, SKU WDBGES0050BBL-WESN, the native USB-C version with a USB-C to USB-C cable in the box. The same 5TB drive also comes in black, red and teal.
What works. What doesn't.
Speed
WD lists the interface as USB 3.2 Gen 1, 5Gbps, and the cable as 5Gbps, without a transfer rate in MB/s. It is a spinning hard drive, not an SSD.
Storage media
A sealed 5TB hard drive with no card slot, shipped formatted exFAT for Windows 10 or later and macOS 11 or later. Apple's Time Machine offers to erase and reformat a non-APFS disk when you pick it as the backup disk.
Power
The box holds the drive, a USB-C to USB-C cable and a quick install guide, with no power adapter. WD does not publish a power figure. Operating temperature is listed as 5C to 35C.
Read the bigger picture.
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MacBook Air ports support 40Gbps Thunderbolt drives, but 20Gbps USB 3.2 drives fall back to 10Gbps. Three drives, and Apple's Time Machine size rule.