Like all CQRobot products, this one is well documented. Go to their awesome wiki, search for the SKU "CQR37D" and you can find all sorts of information about it and some code examples to use with Arduino. This is a really good engine with lots of torque. It works very well and is much better documented than most engines I've built in the past. Like most CQRobot products I would highly recommend it - it's a good brand with reliable parts.
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