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Brand New, comes with box & user manual.

Overview:
Armor Dual Buffer
It is an effect combining Buffer and Booster together. The Buffer is designed to reduce tone and dynamic loss caused by long cables, multiple FX pedals, or TRUEBYPASS connections. Built-in 2 groups of Buffer: In Buffer supports more effective and closer connection between your guitar and effect chain, keeping the original signal into the effects at maximum level; Out Buffer is connected between effect chain and amp system, making your output signal reach to your amp system perfectly. Additional Boost controlled by foot switch, provide you a 20dB gain range.
ARMOR BUFFER proves to be the firmest fortress to preserve your tone.
True Bypass design.

Well built little box.

Hand soldered. Rugged metal case. No tone loss with True Bypass 3PDT foot-switch Affordable Price, Luxurious Sound !

 Features：

 Brand: JOYO

• Model: Dr.J D57
• Armor Dual Buffer
• Weight: 250g
• Dimension: 118*68*50(L*W*H)mm
• Power: 6F22 9V Battery/ DC 9V adapter (Not included)
• Running Current: 12 mA
• Output Impedance: 1 KΩ
• Input Impedance: 1 MΩ

• Note:
  Power supply not included.
  Please use a 9V DC power adapter whose polarity is negative centre otherwise, the product may not work properly.
  
  Package List:
  1 * Effect Pedal
  1 * User Manual(English & Chinese)