Alternating Currents installed replacement interconnected smoke alarms including two combination carbon monoxide/smoke alarm units. Everyone I spoke with from start to end of the project was professional and personable. The cost was reasonable and I was able to schedule service easily. The tech who did the installation (Jim) was great. He explained what he was doing, was careful and respectful about my property. I enjoyed meeting him and feel he did the work quickly and well. I highly recommend Alternating Currents based on my experience.