The JST SM series are a bit big and bulky, but that’s part of their appeal. Robust and latching, they lock together in only 1 orientation, pass a fair amount of useable power (3A AC)

These 2-wire color coded cables are 15cm long and come as a set:

• 2-pin JST SM type connector plug
• and a matching 2-pin JST SM type receptacle connector

For more information, check the JST SM Connector datasheet.