What is a Wireless 802.11a/b/g/n Card with Bluetooth (Dual Band)?

NASABOEING

New member
Can you please more about this and which is better, and can you please have a link to a picture if you can but just tell me which is better. Thanks

Wireless 802.11b/g/n Card

Wireless 802.11a/b/g/n Card (Dual Band)

Wireless 802.11b/g/n Card with Bluetooth

Wireless 802.11a/b/g/n Card with Bluetooth (Dual Band)
 
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