iPhone support
Lexar lists Mac OS X 10.8 or later, Windows 10/8/7/Vista/XP and a USB-C port. It does not list iPhone or iOS.
Lexar Professional USB-C Dual-Slot Reader
A small USB-C reader with an SD slot and a microSD slot, both rated for UHS-II cards. Lexar lists up to 312MB/s with UHS-II cards and up to 170MB/s with UHS-I cards.
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Lexar part LRW470U-RNHNU, North American retail version. Black body with a gray top panel, one SD slot, one microSD slot and a built-in USB-C cable.
Lexar part LRW470U-RNHNU, North American retail version. Black body with a gray top panel, one SD slot, one microSD slot and a built-in USB-C cable.
What works. What doesn't.
Speed
Lexar lists up to 312MB/s read with UHS-II cards and up to 170MB/s with UHS-I cards, and says results vary with system configuration and card speed. The UHS-I figure is above the SD Association's 104MB/s UHS-I bus maximum, and Lexar does not say which cards reach it. The reader uses a USB 3.2 Gen 1 interface. Plugged into a USB 2 port, such as the right-hand port on MacBook Neo, it is limited to that port's 480Mb/s.
Storage media
SD and microSD cards, UHS-II and backward compatible with UHS-I, in two separate slots. No adapter is needed for microSD.
Power
Lexar does not publish a power draw or say whether the reader needs external power. It has no power input or pass-through charging port.
Read the bigger picture.
StorageBuying guide
SD card readers for Mac: check for a slot before you buy one
Which Macs have a built-in SD card slot, which port to use on MacBook Neo, and three USB-C readers for SD and microSD cards on a Mac.