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Our 6V Ripcord is compatible with the MC-707. You'll need one Ripcord, a polarity reversing tip, and a power bank.
Here's a link to the Ripcord USB cable:
myVolts 6V Ripcord USB to DC power cable, centre positive, model AA924MS
DC Tip Adapter 2.1mm to 2.1mm Polarity Reverser
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