Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 1.5-mile most actually

I bought a pair from buy.com 2 years ago because it claims 10 miles effective distance. When we went to Vermont on two cars, we tested it on MA highway where no hills or other obstacles between us. The actual working distance is about 1.5 mile for the most. When it gets beyond that limit, the other end can't get out messages although they are visually in sight.Plus, this item is pretty bulky to carry.The only regret is there is no "0" star rank here.