Logitech M185 Faq page 20


Avoid using your mouse on dark or transparent surfaces, such as glass. These surfaces
cause the optical sensor to use more power.

Make sure replacement batteries are new and within the manufacturer's expiration date.
 +No optical light visible on the M185
Your mouse uses an infrared (IR) optical LED that is invisible to the human eye.
If you're not sure whether your mouse is turned on, check the ON/OFF switch located on the
bottom of the mouse.

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.
 +Purchasing a replacement Unifying USB receiver for the M185
Your M185 mouse is a "Unifying ready" device that can be used with any Unifying USB
receiver. If you've lost or damaged your receiver, you can purchase a replacement from the
M185 Parts Store.
You can determine if your Logitech devices are Unifying by this logo that is printed on the
bottom of your M185 mouse: