Shenzhen Mooer Audio Co., Ltd. is a manufacturer of musical accessories, especially effects units, based in Shenzhen, China.
The company's most popular series is made up of compact guitar effects pedals, called the Micro series. The design of the pedals revolve around a normal sized knob in the center that controls a main function, and two to three smaller knobs that control other functions. Most of the pedals are made to be similar to other popular pedals
source: Wikipedia