It is a controller mode switch button.

[S] is for Switch mode, the controller is compatible with Switch console including Switch Lite/OLED on this mode.

[D] is for D-input mode, the controller is compatible with Android device on this
mode.

When it’s connected to Switch, the corresponding buttons are as below: [Screenshot = STAR button]/ [Home button = Logo button]

HD rumble, notification LED, Turbo and NFC functions are not available on Switch. When it’s connected to other devices, [STAR button = Turbo button].

You cannot wake up your Switch wirelessly with this controller.

Yes it does, but only on S mode.

It works with Switch/Lite/OLED and Android devices and It’s able to auto-reconnect to the devices above once they have been successfully paired.

We suggest you charge it via a phone power adapter. The controller uses 480mAh rechargeable battery with 1-2 hour charging time. The battery can last up to 20 hours when fully charged.

This might be the reason that there were too many controllers connected to your Switch, as one Switch can take up to 8 controllers maximum at a time. Please follow the instructions below and try again:

1. Upgrade the Lite 2 controller to the latest firmware version via Upgrade Tool first；

2. Change the mode switch to [S], connect it to the Switch via USB cable and wait for it to sync；

3. Unplug the USB cable when the syncing is done then press HOME button to build the wireless connection.

It depends on the number of controllers that each device can take. Generally, multiple Lite 2 controllers can be used simultaneously.

10 meters. The controller functions the best within the range of 5 meters.