The cm2020 is Cellphone Mates most powerful dual band amplifier.  It is made for office use and has a gain of 65 dB. It can cover a maximum area of up to 30,000 square feet. This amplifier is a “True Multi User.” That means that the amount of people being able to use it is unlimited. It also has a dip switch which enables you to be control the dB. This is an advantage for users using it in a room which might be a bit too small and does not need the full 65db gain. Cellphone Mate recommends that there should be a distance of at least 75 feet (linear) between the interior antenna and the outdoor antenna.

Note: The amount of area that can be amplified is also dependant on the strength of the signal outside the building. The stronger the signal the more the area it can be used for. The maximum area is 30,000 square feet.