How do I open the Genius Mouse Pen to change the battery?

Hello :) we have the same problem regarding the same brand and product. But I got mine working just a while ago.
Try this: Control Panel>Pen and Touch
under pen options, there should be settings regarding the pen buttons. Unclick the "use the pen button as a right-click equivalent"
hope this helps though although it's been a year XD

My i608 pen stopped working today. I've had it for a month. The mouse was working fine, but the pen wouldn't work at all. Then I left the mouse on the pad and used the pen while the mouse was on the pad, and the pen started working again. Now it works even without the mouse on the pad. Did it re-establish the radio connection or something by doing that? Anyway, saved me the $25 replacement cost.

Go to LINK.

I have two cricut machines that the start button will not turn the machine on. What can I do?

Check if there is a syncronise button or connect button on both the pen and the tablet.

There is two sections of the pen. *I have the same tablet from what you described.* Twist and pull gently apart the two sides of the pen. It will open, and the battery pops out.

Try putting a new battery in it. Mine was having the same sort of problems, and they were pretty much entirely fixed by a new battery.

ok i had the same problem BUT i opened the mouse pen control panel and under info i unchecked the "support tablet PC feature" and to my amazement it worked. hope it works for you :)

Change the Batteries ?

I have a G-Pen 340 which i just bought and the pen isn't being registered on the computer. The green light isnt even flashing :( I dont know whats wrong with it.