USB A
The number of USB inputs located on the body of the card reader or hub (see “Type”). This parameter determines the number of USB ports you will have at your disposal after connecting the device. "Pure" card readers and combined models usually have 1,
2, and even
3 USB inputs, while hubs typically feature
4 or more ports.
microUSB
The presence
of a micro USB port for connecting peripheral devices in the design of the hub (or a card reader with a hub function — see "Type").
The main scope of microUSB is portable equipment — smartphones, tablets, etc. Accordingly, it makes sense to purchase a hub with such a connector if you want to connect peripherals that were originally designed for mobile gadgets to a PC — for example, flash drives for smartphones with USB OTG function. Usually there is only one microUSB connector — more is simply not required.
Cable length
The length of the cable supplied with the device. Mostly relevant for models with a non-removable cable that cannot be replaced.
Activity indicator
Light indicator, indicating that data is currently being exchanged between the memory card and the computer to which the card reader is connected. This allows you to avoid disconnecting the card reader during operation, which is fraught not only with data loss, but even damage to the device.
