does it have a headphone jack for a mic?

No, just a port (USB C) for charging

Can I buy 2 of the same controller and have them work independently?

It depends what "have them work independently" means. You can pair them both to the same Switch, or different Switches, or pair one to a Switch and leave the other one in a drawer or give it to your cousin for Hanukkah. Think of it like buying two of the same power drill on Amazon: they don't have to be used for the same project -- they can be used independently.

ASIN	B08GH6WY13
Additional Features	Rumble
Best Sellers Rank	#432 in Video Games ( See Top 100 in Video Games ) #15 in Nintendo Switch 2 Controllers #18 in Nintendo Switch Controllers
Brand Name	PowerA
Button Quantity	20
Color	Mario Pop
Compatible Devices	Nintendo Switch
Connectivity Technology	Bluetooth
Controller Type	Gamepad
Customer Reviews	4.4 4.4 out of 5 stars (14,970)
Global Trade Identification Number	00617885025624
Hardware Platform	nintendo_switch
Included Components	Enhanced Wireless Rechargeable Controller, 10 ft (3m) Charging Cable, User Manual
Item Dimensions	6.02 x 4.41 x 2.48 inches
Item Weight	8 ounces
Manufacturer	PowerA
Model Name	Rechargeable
Package Quantity	1
Power Source	Battery Powered
UPC	617885025624 617885019265
Warranty Description	Two-year limited warranty - visit PowerA.com/Support

PowerA Enhanced Wireless Nintendo Switch Controller - Mario Pop, Rechargeable Switch Pro Controller, Immersive Motion Control and Advanced Gaming Buttons, Officially Licensed by Nintendo

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