I-Rocks RF-7550A Kurzanleitung Zur Installation Seite 5

2.4GHz Digital Cordless Optical Mouse (USE)
+ Turn on the power switch to ON position to see the sensor light up
or not; If the light not work, please re-check the installed batteries
are collect or not.
E (Battery empty LED.)
+ Two conveniently located side-buttons allow you to easily go back
and forward in your web browser.