Most appliances do not generate interference that affects X10 operation. However, occasionally you may come across an appliance that generates enough noise to affect reliable X10 operation. Simply plug the appliance into this filter and then plug it back into the receptacle to remote the noise. This devices also completely blocks X10 signals so you can use to it to isolate a group of devices on a power strip as long as the total load does not exceed 5A. The physical dimensions of the module are 2.3" x 2.9" x 1.4"