GD-81 Tuner-Power:
Tuner Power 2 in 1
1.Tuner Mode
Tuning options:Chromatic
4 Led display,Sensitive and stable.
When you switch to this mode,the sound off.
2.Power Supply Mode
18V Input
9v Output:6 outlets deliver 100Ma
2 outlets deliver 500Ma
There is no noise when you switch.