Addressable power supply for a camera.
Ratings depending on the model number of the power supply.
One output is On all the time. To power the camera.
The other supply output is turned On and Off by an X10 command. To control the RF transmitter in the camera. So only one was on at a time and didn't step on each other. Addresses where in groups of four. Same house code. Units 1-4,5-8,9-12 and 13-16. Turn one in a group on the other three went off with no needed off command.
This one is for the Ninja Pan and Tilt base.
http://kbase.x10.com/wiki/XM14AThis one with a lower output rating was used on some of the cameras.
http://kbase.x10.com/wiki/XM13A