I-Rocks 1600 dpi Laser IR-7521L - Manual (Page 6)

1600 dpi Laser Mouse 5
Troubleshooting
I do not see the laser light when the mouse is active.
Unlike traditional optical mice, the light is not
visible when the laser mouse is active.
To make sure the mouse is on and functioning
properly, move the mouse back and forth and
check to see if the cursor responds.
The mouse does not work on a mirror or glass surface.
Thought rated for most of these kinds of surfaces,
occasionally there will be one such surface that will
cause the mouse to work improperly or not at all.
If you are using the mouse on a reflective or
mirrored surface, move it to another surface