Checking how it sound from here:https://www.youtube.com/watch?v=K-TOdIRg1Pc&t=104sDescription:Organic sounding analog delay pedal combining the sounds of classic tape / echo delay with modern delay design to produce an extremely versatile sounding delay pedal. The LEF-314 has an adjustable delay time ranging from 20ms right up to 620ms, useful for a wide range of music styles. The echo control adjusts the amount length of time the delayed sound will ring out for, while the feedback knobs gives control over the intensity of the delayed sound. Being a truly analog delay, with the feedback right up, the LEF-314 is capable of producing a positive feedback loop, great for ending a show!Features1.Power Supply?9V DC (Negative in the center).2.Echo Knob?Echo to adjust the delay of the level.3.F. back Knob?F. back to adjust the delay of the feedback.4.Time Knob?Controls delay time for 25ms-600ms.5.Input & Output Jack?Analogy though 1/4?? mono audio jack.6.LED Light?LED indicator shows the working state.7.Full metal shell?High quality zinc alloy classic, stable and strong.8.True Bypass?True bypass for zero tone coloration.Specifications:Input Impedance:1m OhmsOutput Impedance:470k OhmsPower Supply: DC 9V (Plug polarity is Positive on the barrel and negative in the center)Working Current: 42mAPackage included:1 x Rowin delay guitar effect pedal1 x User's Manual1 x gift box