An extra EU/US/UK plugs for this power supply are purchased separately (you can choose):
The User Manual and other additional materials for this device can be found in the AMT Media Center http://media.amt-sales.com/
It is for bass guitar:
yes
It is for electric guitar:
yes
Power Type:
AC (50Hz / 60Hz)
Range of operating voltage (V):
100-240
The polarity of the power supply connector:
minus is inside, plus is outside
URL of the product on the official website:
http://amtelectronics.com/new/amt-dc-18v-2a/