dongle

US /ˈdɑːŋ.ɡəl/
UK /ˈdɑːŋ.ɡəl/
"dongle" picture
1.

a small device that connects to a computer or other electronic device and provides it with additional functions or access to a network

:
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I need a USB dongle to connect my wireless mouse.
•
The new laptop comes with a Wi-Fi dongle.
:
adapterkeystickdevice