The environment where you use the radios will determine what band (VHF or UHF) will serve you best. How much coverage you desire will determine the power you need. The number of talk groups you have will determine how many channels are best suited for your use. Example: If mostly indoors in a 3 story, 200,000 s.f. building with plans to use 4 talk groups – two good options for this application would be the RMU2040 or the CLS1410.