Question 1

am i only allowed to use one controller with this?

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

Is there any major lag?

Accepted Answer

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.

Question 4

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

Accepted Answer

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

ASIN	B09PT92QL1
Best Sellers Rank	#31,447 in Computers ( See Top 100 in Computers ) #93 in Bluetooth Network Adapters
Brand	MAYFLASH
Color	black
Compatible Devices	Gaming Console
Connector Type	USB Type C
Country of Origin	USA
Current Rating	1 Amps
Customer Reviews	4.4 4.4 out of 5 stars (1,035)
Finish	Matte
Input Voltage	5 Volts
Item Dimensions	7.3 x 2.1 x 0.8 centimeters
Item Weight	0.04 Kilograms
Manufacturer	MAYFLASH
Mfr Part Number	MAGICNS2
Model Number	MT-010091
Nominal Power	7.5 Watts
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	Video Game Console
Unit Count	1 Count
Warranty Description	Life time
Warranty Type	Lifetime

May Flash Magic Ns 2 Wireless Bluetooth Usb Adapter For Switch/Switch Oled, Windows, Raspberry Pi, Compatible With Xbox Series X & S Controller, One Ps5 Controller And More

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