Digital Monster Pendulum Likely ver. 1 and ver. 5. The battery cover on ver. 1 does not appear to be the original. I have confirmed it works, but the pendulum function may be broken. The screw on the battery cover of ver. 5 may not be original. The pendulum function on this one seems to be working well. Both seem to have button response, and sound is produced. Please take a look at the photos and purchase if you are satisfied. Thank you for looking.