Sony MHC-M40D Operating Instructions Manual page 20

 AC power cord (mains lead)
Connect the AC power cord (mains lead) (supplied) to the unit, then plug it
into a wall outlet.
When the AC power cord (mains lead) is connected, the demonstration
(page 25) starts automatically. If you press  (power) to turn on the
system, the demonstration ends.
20
GB
AC power cord
(mains lead)
(supplied)
To the wall outlet