Using this JST 4 - hole female connector is easy. First, select a wire within the 28 to 26 AWG range. Then, take a crimp pin and attach it securely to the wire using a suitable crimping tool. Next, insert the crimped wire and pin into the 2.0mm 4 - pin mating connector housing. When handling, be gentle to avoid bending the pins. Store the product in a dry place to prevent rusting. If you need to clean the connectors, use a soft, dry cloth. That's all you need to know to make the most of this great product.