am i only allowed to use one controller with this?

For individual players with their individual controller you need individual dongles for example: 4 users, 4 players on the switch, 4 controllers, 4 dongles, work, you will need a usb hub to connect the 4 dongles there are some hub docs that come with 4 usb's. However if you want to have shared control over one player then use one dongle for all the controllers. for example: 4 users, 1 player on the switch, 4 controllers, 1 dongle. For this you won't need a hub, and may be fun to assign people to work certain buttons, or may be madness.

Is there any problems syncing contollers back to original console, does using this wipe out their firmware?

No, the controller syncs with the adapter. just re-sync your controller with the console. If you're on ps4 it's share+[PS] button to wireless sync or plug controller into console with micro usb cable. leave plugged in for 5-10 seconds and you're paired, just unplug controller. If you're on Xbox, with console on press pair on controller then press pair button on console. if you're on switch use touch screen then go to "controllers" then "change grip and order" then press pair button on controller.

Is there any major lag?

For most modern 3D games designed for HD tvs, you won't notice any lag at all (Zelda BofW, Mario Odyssey). However, play something that requires incredible precision, like MegaMan 11 (which seems to require the sharp timing of the older CRT-intended games), and you will notice enough lag to get you killed when using a wireless controller. For this game specifically, I used a wired controller with this adapter and the difference is noticeable.

Does this keep the analog sticks working properly, or does it function as a D pad?

For JoyCons with the Switch, the analog sticks work as a d-pad on both sticks.

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Description

🎮 Level up your game with universal wireless freedom!

PLUG PLAY CONVENIENCE - Instant setup with USB Type-C—no drivers, no hassle.
CROSS PLATFORM POWERHOUSE - Works flawlessly on Switch, PC, Steam Deck, macOS, and retro consoles.
ENHANCED GAMEPLAY FEATURES - Turbo mode, auto-fire, and customizable rumble intensity for pro-level control.
MOTION FEEDBACK PRECISION - 6-axis gyroscope and adjustable rumble bring immersive gaming to life.
UNIVERSAL CONTROLLER COMPATIBILITY - Seamlessly connect Xbox, PlayStation, Switch & more—wireless or wired.

The Mayflash Magic-NS Wireless Controller Adapter is a compact, USB Type-C device that enables seamless wireless and wired connection of multiple controllers—including Xbox Series X/S, PS5/PS4, Nintendo Switch Pro, and more—to Nintendo Switch, PC, Steam Deck, and other platforms. It supports advanced features like turbo mode, auto-fire, 6-axis motion sensing, and adjustable rumble, delivering a versatile and immersive gaming experience across modern and retro systems.

Specifications

Brand	MAYFLASH
Manufacturer	Mayflash
Model	MAGIC-NS
Model Year	2017
Product Dimensions	8.89 x 5.59 x 1.52 cm; 30 g
Item model number	MAGIC-NS
Original Release Date	2017
Operating System	Nintendo Switch
Hardware Platform	nintendo_switch
Hardware Interface	USB
Compatible Devices	Desktop
Mounting Hardware	Magic-NS adapter
Number of items	1
Wattage	1
Batteries Included	No
Batteries Required	No
Cable feature	Without Cable
Type of cable or wire	USB
Data Link Protocol	Bluetooth
Number of Ports	1
Device type	Components Other
Has Auto Focus	No
Programmable Buttons	No
Manufacturer	Mayflash
Country of Origin	USA
Item Weight	30 g

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