No optical light visible on the MK270 mouse
Your mouse uses an infrared (IR) optical LED light that is invisible to the human eye. This means you won't be able to see the light emitting from the bottom of your mouse.
If you're not sure whether your mouse is powered on, check the ON/OFF switch located on the bottom.
NOTE: The M185 mouse is included in the Wireless Combo MK270.
When your mouse is:
ON — The switch is pushed over to the right and you see green next to it.
OFF — The switch is pushed over to the left and you see red next to it.