What is the USB dongle? Is how important it?

On the cable USB runs that came with my Clip + there is a small dongle in the Middle, more near the mini usb plug. Is it a fuse? Is how important it? I noticed a lot of people say they have used any old random other USB cable without problem on the Sansa Clips. But it seems atypical of a USB cable to get a dongle/fuse in the middle like that. Also, if I use this cable with other devices (like my phone), so I don't have that for the operation of a cable autour, the dongle/fuse will affect it? Thank you.

Fine to use other cables USB with the Clip; fine to use the USB cable with other devices.  The dongle is supposed to help clean up the signals.  Here is some information I found; others will have probably more.

Ferrite cores are used around cables for electromagnetic interference (EMI)
deletion. They reduce foreign currents in the wires produced by
Grand, near radiofrequency fields as radio AM, TV transmitters
transmitters, radio amateur, edge radio, etc. These currents, while
generally not strong enough to cause damage, can disrupt the sensitive circuits
computers or devices causing data errors. Use of these cores will be
no effect on the transfer of the desired data from the camera to the computer
via the universal serial (USB) Bus.

Tags: SanDisk Sansa

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