Future Retro Swynx - Manual (Page 5)

POWER
A universal power supply is provided with your unit. This power supply
can be used in any country simply by using the correct AC plug
(included) for your country.
This power supply is a 9V DC center-pin positive, outer-pin negative type
supply and should only be replaced with the same type if ever lost.
Never use AC output power supplies to power the Swynx!
Insert the power supply into the wall outlet. Connect the DC output plug
to the power jack located on the back panel of the Swynx.
There is no power switch, this unit will be on any time power is
connected.