If you need power for your M-DCBASE motor, then you will need the ADJ M-DCB/PSU. It offers 1.5V of power so the motor will operate as it is built to.
When you buy the MB-8 Combo, it does not come with the power supply for the M-DCBASE. So make sure to pick this up if you are also purchasing the MB-8 Combo.
The slim profile of the power supply will really let you plug it in anywhere on your power strip. The cord on the M-DCB/PSU is of substantial length, so you should have no problem reaching your power strip or wall outlet.
Running the incorrect voltage to a device can have disastrous effects. So pick up the M-DCB/PSU to make sure that you have the right power running to the M-DCBASE.