They work with any computer that has a USB port, to a USB device.
A USB switch box should work for external USB drives.
yes but usb 2.0 devices dont work on usb 1x
USB power strips work with any USB wall charger so long as the device can charge over USB.
The USB power strips will not work with the AC power adapter without the USB connection.
Yes it should work. Vice versa as well.
If your BlackBerry uses micro usb to charge then it will work.
Not all USB mice will work with an adapter. If it did not originally ship with an adapter, that you lost and are now replacing, then odds are it will not work. A USB hub adding more USB ports may be a better solution.
you plug it into a usb port on a computer and it does its magic.
Yes, but at USB 1.0 speeds
Your external USB 3 HDD may work on your old laptop which only has USB 2. Most of the USB 3 will work on a USB 2 if you have the proper speed cable. It will only operate at the 2.0 speed, however.
Whether or not a USB desk fan will work on an HDTV's USB port depends on the purpose of the port. However, in most cases, it will likely power the fan.