Logitech MK540 Advanced Wireless Keyboard Mouse Combo - Black

The keyboard has a battery indicator LED that lights up when the battery is low. You can also use the battery check hot key.

No, the MK540 combo is designed to connect to one device at a time. However, you can use the Unifying receiver to connect to other compatible Logitech devices.

Yes, you can customize the hotkeys using the Logitech Options software, available for download on the Logitech website.

The wireless range is up to 10 meters (33 feet).

The keyboard uses two AA batteries.

The mouse uses one AA battery.

Yes, the keyboard is spill-resistant up to 60ml of liquid.

Ensure the devices are turned on, the receiver is securely plugged in, and the batteries are correctly installed. Try moving the devices closer to the receiver. If the issue persists, try re-pairing the devices using Logitech Options software.

Check the surface the mouse is on. Ensure it is not reflective or transparent. Clean the mouse sensor. If the problem continues, try a different USB port.

Ensure the keyboard is turned on and within range of the receiver. Check for any obstructions between the keyboard and receiver. Try replacing the batteries.

Try plugging the receiver into a different USB port. Restart your computer. Check for any driver updates through the Logitech website.