Common JST BEC connectors available in male or female versions. These feature 22 ga wire with a length of 100mm. 2.5mm pin spacing, rated for 250V and 3 amps.
Note that some neopixel/led strip installations may exceed the current draw limit of these connectors. It is very common to remove the connector on most installations as the wire gauge can handle the typical 15A draw of led strips without concerns.
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