Yes, they can. Here are the steps to sync them:

1. Connect the EK01 keyboard to the EM11 mouse USB receiver (please make sure that you are currently in USB mode):
   
   
   • Insert the USB receiver of the EM11 mouse and turn on the mouse;
   • Turn on the keyboard, and press Esc and + buttons for 3 seconds to enter pairing mode, if you see the USB mode indicator light is flashing, then you have entered the pairing mode;
   • Once you have entered the pairing mode, quickly unplug and plug in the USB receiver for the mouse;
   • And there we paired two ProtoArc products with one USB receiver.


2. Connect the EM11 mouse to the EK01 keyboard USB receiver (please make sure that you are currently in USB mode):
   
   
   • Insert the USB receiver of the EK01 keyboard and turn on the keyboard;
   • Turn on the mouse, and press the right, left, and middle buttons of the mouse for 3 seconds to enter pairing mode, if you see the USB mode indicator light is flashing, then you have entered the pairing mode;
   • Once you have entered the pairing mode, quickly unplug and plug in the USB receiver for the keyboard;
   • And there we paired two ProtoArc products with one USB receiver.

1. For 2.4G mode (please make sure the mouse is currently in 2.4G mode):
   
   
   • Press and hold the middle scroll button and the left and right click buttons simultaneously for 5 seconds until the 2.4G wireless indicator light flashes
   • Insert the 2.4G USB receiver into your device, and the mouse will connect to your device automatically.


2. For Bluetooth mode:
   
   
   • Turn off the mouse.
   • Press and hold the middle scroll button and the right-click button simultaneously while turning on the mouse. The Bluetooth channel 1 indicator light will flash quickly.
   • Connect the mouse to your device via Bluetooth.

1. Ensure the mouse is fully charged before use.
2. Confirm that the mouse is in the correct mode by checking if the corresponding connection channel light is flashing.
3. If you are using the USB dongle to connect the mouse:
   
   
   • Unplug and replug the USB dongle into your device.
   • Try using a different USB port on your device.

   If you are using Bluetooth to connect the mouse:

   • Delete the mouse Bluetooth pairing from your device's Bluetooth listing.
   • Restart your device.
   • Repair the mouse with your device by following the pairing instructions.


4. Attempt to connect the mouse to other devices to determine if the issue persists.

If the problem continues, please refer to the re-pairing and resetting Bluetooth steps mentioned earlier to re-pair the mouse with the USB dongle and reset the mouse's Bluetooth connection.

1. Ensure that the mouse is fully charged before proceeding with any troubleshooting steps.
2. Refer to the instructions provided earlier for re-pairing the mouse with the USB dongle and resetting the mouse's Bluetooth connection.

1. Press the DPI button on the mouse to adjust the DPI settings (1000/1600/2400).
2. Each press of the DPI button corresponds to a different DPI level, indicated by the red light flashing once, twice, or three times for DPI 1000, 1600, or 2400, respectively.

The scroll wheel of the mouse operates in a gear-like manner and does not spin freely.

1. The mouse buttons are not programmable.
2. Please note that the Forward and Backward buttons are not compatible with MAC OS.

1. Restart your computer and reconnect the mouse to your computer.
2. Try wiping the scroll wheel with a small amount of alcohol and use a hair dryer to blow out any foreign objects that may be affecting its performance.
3. Ensure that the mouse is fully charged, as a low battery can impact the mouse's functionality.
4. If the problem persists, try connecting the mouse to other devices to determine if the issue is device-specific.

1. Yes, the RGB light can be turned off.
2. To turn off the RGB light, press and hold the light mode switch button for 3-5 seconds.

1. Make sure you are using the charging cable that came with the mouse. The mouse can only be charged with USB A to USB C charging cables.
2. Try connecting the charging cable to the USB port of your computer. The mouse requires a charging interface with an output of 5V. The USB port on your computer is the recommended choice for charging.