Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Poor Performer

Based on Uniden's reputation and excellent performance of a 900mhz Uniden in my house, I bought 2 of these to replace (cheap)2.4 ghz GE phones for use in a large barn. The cheap phones would cover the entire interior of the barn, with some capability outside. The Unidens, mounted on the same RJ-11 sockets, will not even work for the length of the barn. I plan to write to Uniden and express my discontent.