Domino is an analog octave, based on the classic ringer. The effect can be ring mod-like or up an octave, depending on your playing. Right jack is input and left jack is output. 

Specifications

• 97mm x 42mm x 48amm
• 1/4" mono jacks
• 2.1mm DC connector
• 9VDC center negative
• Current draw: 10mA