Aroma ADL-3 Mini Delay Electric Guitar Effect Pedal with Fastener Tape Sticker Aluminum Alloy Housing True Bypass Mini in size, fit in the hand of the adult or just put it into pocket. Light-weight and portable, easy to carry along. Allows wide range of delay time from 50ms to 400ms. True bypass design, minimize tone loss and get more control of your pedal. 3 adjustable knobs: Time, Feedback, Level.Powered by a 9V power adapter (not included).