iPhone support
SanDisk's data sheet lists macOS and Windows and says nothing about iPhone.
SanDisk Professional PRO-G40 SSD 2TB
A rugged SSD with one USB-C port that runs as a Thunderbolt 3 drive on a Thunderbolt Mac and falls back to 10Gbps USB elsewhere.
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2TB, model SDPS31H-002T-GBC1D, rated up to 3,000MB/s read over Thunderbolt 3, with a Thunderbolt 3 cable in the box.
2TB, model SDPS31H-002T-GBC1D, rated up to 3,000MB/s read over Thunderbolt 3, with a Thunderbolt 3 cable in the box.
What works. What doesn't.
Speed
SanDisk rates it at up to 3,000MB/s read and 2,500MB/s write over Thunderbolt 3, and 1,050MB/s read and 1,000MB/s write over USB 3.2 Gen 2. Amateur Photographer tested a review unit on an M2 MacBook Air over Thunderbolt 3. Its packaging listed 2,700MB/s read and 1,900MB/s write, lower than the data sheet's figures.
Storage media
A sealed 2TB NVMe SSD with no card slot. SanDisk ships it formatted exFAT, says it can be reformatted to APFS, and lists macOS 10.13 or later as Time Machine compatible.
Power
The box holds the drive, a Thunderbolt 3 cable and a quick start guide, with no power adapter, so it runs from the computer's port. SanDisk does not publish its power draw. Operating temperature is listed as 5C to 35C.
Read the bigger picture.
StorageBuying guide
External drives for MacBook Air: why 20Gbps USB 3.2 drives run at 10Gbps, and how big a Time Machine disk to buy
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.