Flexible controls, easy to use
7 shift types, 2 function knobs and 3 way toggle switch. Donner's Octave pedal can provide more than one ideal sound.
Buit to Last
Whole Aluminium-alloy classic, stable and strong. LED indicator shows the working state.
Efficient chip
High-quality electronic components and circuit design. Keep your tone clear and pure.
True bypass & Min size
Let the instrument's signal pass through a non-electronic bypass line. Mini size, easy to go and pedal-board friendly.
Donner Mini Guitar Pedals
 Harmonic Square |  Triple Looper |  Vebr Square |  Yellow Fall |  Stylish Fuzz |  Bluse Drive |  White Tape | |
|---|---|---|---|---|---|---|---|
| Effect | Octave/ Pitch Shifter | Looper | Reverb | Delay | Fuzz | Overdrive | Tape Delay |
| True bypass | Yes | No | Yes | Yes | Yes | Yes | Yes |
| Features | 7 shift types & 3 tone modes | 90 mins Loop with Screen | 7 reverb modes | Classic vintage analog delay | Classical fuzz | 2 modes with TS overdrive | Legendary Tape Echo Emulation |
| Material | Whole Aluminium-alloy | Whole Aluminium-alloy | Whole Aluminium-alloy | Whole Aluminium-alloy | Whole Aluminium-alloy | Whole Aluminium-alloy | Whole Aluminium-alloy |
| Power Supply | 9V DC (Not Included) | 9V DC (Not Included) | 9V DC (Not Included) | 9V DC (Not Included) | 9V DC (Not Included) | 9V DC (Not Included) | 9V DC (Not Included) |
About This Item
- Octave/Pitch shifter Pedal: With 7 shift types and 3 tone mode toggles, Harmonic Square guitar pedal gives you 21 options of semitonal, octave and detune sounds
- 3 Tone Modes: Sharp (pitch up), Flat (pitch down), and Detune (adjustable pitch signal shifted by 10 cents)
- WET and DRY Knobs: WET Knob adjusts the harmonic signal level; DRY Knob adjusts the dry signal level
- Built to Last: Whole Aluminium-alloy classic, stable and strong; LED indicator shows the working state
- True Bypass: Digital circuit design, true bypass provides a transparent tone
- Kind reminder: Please power the pedal with a 9V DC adapter (NOT Included), center negative polarity, and a minimum of 500mA current for optimal performance
Technical Specifications
| Brand | Donner |
| Model | Harmonic Square (EC966) |
| Effect Type | Octave / Pitch Shifter |
| Shift Types | 7 shift types |
| Tone Modes | 3 (Sharp, Flat, Detune) |
| Controls | WET Knob, DRY Knob, 3-way Toggle Switch |
| Bypass | True Bypass (Digital Circuit) |
| Material | Whole Aluminium-alloy |
| Power | 9V DC Adapter, 500mA, Center Negative (NOT Included) |
| Dimensions | 3.7"L x 1.7"W x 2"H (2.36 x 2.44 x 3.94 inches) |
| Weight | 0.25 kg (0.55 lbs) |
| Input/Output | 1/4-inch Audio Jack |
| Signal Format | Digital |
| Warranty | 2 Year Manufacturer |
What's in the Box
1 x Donner Harmonic Square Octave Pedal
1 x User's Manual
On Jun 25, 2026 at 07:16:29 PDT, seller added the following information: