From inside (document excerpt):
ALINCO REMOTE CONTROLLER The DM-330MVE does not include a remote controller. Nor is it available as an optional accessory. It can be easily assembled using the diagram provided. The adjustable voltage ranges from approximately 5-15 volts. 3.5mm stereo plug SWITCHING MODE DC REGULATED POWER SUPPLY DM-330MVE CAUTION ‘The remote controller must be assembled exactly as the diagram shows. Using SP resistors of different values can damage the unit and will void the warranty.
‘When the remote controller is connected, the unit must be turned off. *The maximum length of cable that should be used is 1.5m or 5ft. . ._ –_/ Thank you for purchas’lQ the A1inco switching mode DC regulaled nower suoply. OM33(}, “v!VE. The DM-330MVE instrJChon manual co tains impo’ยท.an; safety and operating i’1S1ructions. Rood th manual carefully before us.og this product.