"A controllable and reasonably priced entry-level pump that can be used for a number of purposes is the Maxspect JUMP DC Water Pump. With the external 4-button controller that comes with every Maxspect JUMP, you can adjust the pump's speed, switch between pulsing flow modes, and idle the pump for feeding. With its exclusive Sine Wave technology, the Maxspect JUMP DC operates almost silently in contrast to the conventional electrical current used by the majority of aquarium pumps. This is the inexpensive, controllable, and almost silent return pump you've been searching for! Qualities: uses sine-wave technology to operate almost silently. features a 4-button controller with 20 flow speed settings for idling and adjusting pump speed, flow, and feed mode. Three feed mode durations—ten, twenty, or thirty minutes Two pulsing modes to produce currents that resemble waves First mode: frequency