HP R707 - Manual (Page 15)

Chapter 1: Getting Started 15
Attaching the Ferrite to the
AC Adapter Cord
A ferrite is included in the box with your
camera. This ferrite prevents your camera
from emitting radio frequency energy that
might interfere with the reception of your
radio, television, or other electronic devices
which might be near the camera. The ferrite
will not degrade the performance or safety of the camera.
Attach the ferrite to the thin HP AC adapter cord (the cord that
attaches to the camera, not the cord that attaches to the wall) in
the following way:
1 Wrap the cord around the ferrite so that
the cord passes through the ferrite two
times (as shown here).
2 Adjust the cord so that the edge of the
ferrite is 10 cm (4 inches) from the end of
the connector that connects to the
camera (or camera dock).
3 Close the ferrite so that it snaps snugly
into place around the cord.