If you just need some kind of indicator to show whether a remote light
is on or off, you can wire a neon lamp (with resistor) across the
switch. In the UK you can buy this ready made as a backplate for a
standard single light switch plate. It`s so you can find the switch in
the dark. When the neon is on, the light is off and vice versa. It`s not
going to beep of course.

Ron