"Note: Please use a power adapter with a voltage of DC9V, an internal negative and external positive polarity and a current of 500mA or more to power your pedal. Failure to do so can cause serious situations where the product does not work or is damaged. Features: 1.Power Supply 9V DC (Negative in the center). 2.Two Modals Normal and Treble. 3.Level Knob Control the sound volume with effect. 4.Tone Knob Control the tone of the sound. 5 Comp Knob Adjust the intensity of compression. 6.Input & Output Jack Analogy through 1/4"" mono audio jack. 7.LED Light LED indicator shows the working state. 8.Full metal shell Aluminum-alloy classic, stable and strong. 9.True Bypass for zero tones coloration. Specifications Input: 1/4″Monaural Jack. Output: 1/4″Monaural Jack. Power Supply: DC 9V (Negative in the center ). Working Current: 140mA. Dimensions: 95(D)*45(W)*48(H)mm. Weight: 250g(With box). 7 Mode Delay Tone The New Delay pedal from Donner Company with the name of Echo Square is also a digital circuit pedal. 7-Mode Delay effects in the whole Aluminium-alloy little stomp box. One pedal let you have 7 different effect delay: Digital, Analog, Tape, Mod, Sweep, Lofi, and Reverse. This is a wonderful pedal. A variety of delay effects adds musical color to your tone. Easy to Control There are three function knobs, namely MIX, TIME, and F.BACK. MIX is used to control the dry/effect signal ratio. TIME is used to control the delay time. F.BACK is used to control the feedback amount. You can just control three function knobs and choose the 7 mode model that you want, and you can make your own music tone. Enjoy your own fun and colorful life. Classic Design As you can see, this 7-mode delay pedal also has a classic mini design: black 'Clock Hand' knobs, a wonderful LOGO design, and a whole aluminum-alloy classic box, very stable and strong. LED indicator shows the working state. A true bypass switch lets your instrument's signal pass through a non-electronic bypass line when the effect is disengaged, feeding your amp with direct, unaltered signal from your instrument."