Instruct: Classify the given review into positive or negative sentiment.
Query: worthless as an intercom

Ii purchased this unit to connect two different rooms at opposite ends of a house. It did not work. I ended up calling the manufacture tech support and was informed that it works via the home wiring. The wiring has to be on the same side of the circuit box also. The unit will not work thru a surge proctor also. Since we live in the mountains, lighting is a common event and nothing in out home goes without circut protection.