The M2o module is the general name for a set of commercial RF amplifiers housed in an SPI module. This makes a large variety of RF amplifiers available for use in the rack as connectorized modules, in a way that is convenient, along with other modules, and sharing the same power supply.
A number of different M2o modules have beem built so far:
M2o1: LNF-LNR4_8ART.
M2o2: GALI-3+.
M2o3: AFS3-00100800-25-ULN.
M2o4: AFS4-00100800-14-10P-4.
M2o5: ZFL-1000LN+.
M2o6: ZFL-500LN+.
M2o7: LNF-LNR4_8F.
The specs of the M2o - such as gain, cut-off frequency, noise - depends on the amplifier selected for the particular design. It is important to note that power supply also depends on the selected part. Some M2o types such as the require a non-standard supply, which can be provided by the user in addition to the standard supplies (see the SPI power section). For example, the M2o1, M2o2, M2o7 run on the SPI-rack native inner 5V level and associated ground, while M2o3, M2o4, M2o5, and M2o6 need an additional 15V supply at the +Vuser input and the associated ground.
You may see some further information on the stand-alone M2o page.