The Rossmont Waver Wireless 2 Channel Controller (Master) is the first controller for AC synchronous aquarium pumps powered at mains voltage (e.g. USA= 120VAC-60Hz). You can adjust the speed and subsequent flow of the two pumps in the Rossmont Mover M4100 Circulation Pumps (2 pack) included in this package by simply plugging them into the Rossmont Waver.
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