You will need an ActiveEye motion detector,
a wireless transceiver module to receive the
Radio Frequency (RF) signal from the motion
detector, and either a lamp module for the
light, or a wall switch for the light,
depending on what controls your light now
(lamp module for plug-in lights, wall switch
module for lights with a wall switch. For
the sound, you will want the remote chime.
There is a kit on sale right now with
everything but the lamp control. Check it
out at:
http://www.x10.com/security/dm10a_s_chtr_ps17 .html
The nice thing about the motion detector, is
it can also turn lights on at dusk, and off
at dawn, using a separate address from the
motion detector. That way, you can have
porch lights come on at dusk, and security
flood lights come on with the motion
detector.
If you are new to x10, I can get you a $15
discount on your first order. Send me an
email at x10nut@netzero.com, and I'll
arrange the discount for you.
Have fun!