I bought two of these units on the basis of an advertised 10 hours of talk time on the Interphone and Mobilicity web site. Very shortly I found the batteries only lasted about 4 hours in intercom mode. I called Interphone U.S. customer service and they had to contact the factory and said they would get back to me. They never did get back, and after two more calls by me they came back and said the batteries would last 10 hours in phone mode, but only 4-5 hours in intercom mode. I asked them for a refund but they said no...that the products met specifications. I explained that I never would have purchased the units int he first place if I knew they only would last 4-5 hours in intercom mode. Now they have changed their website to state 5 hours of time in intercom mode. I also sent an email to their headquarters and got no response. I would never buy anything from this company as they do not stand behind their advertised specifcations on their product, and do not have good customer service.