Seven.Five Duo is an advanced optimization tool ideal for network deployment. Real-time moving maps, state-of-the art data displays, and voice alerts help you easily pinpoint problems. You can even layer in Quality of Service algorithms for functionality unavailable anywhere else. While Solo works with a single phone, a Duo upgrade secures your investment by adding scanning capability, the ability to test with a second phone - of similar or different technology - and the capacity to assess voice and data simultaneously, in-building or in-field.