Regulated power supply 3-12 V 1200 mA by Lexton

Universal power supply with switchable voltage output (3, 4.5, 6, 7.5, 9 or 12 V). Maximum current output is 1200mA.

Power supply comes with 6 adapters with different diameters. Each adapter can be mountet in 2 ways (simply you can switch between +/- on adapter). Photo below shows how to mount adapter to receive positive voltage inside adapter.