The Miniatronics’ Micro Mini Connectors are fully assembled. Each has a mated interlock type assembly. All miniature connectors can be used for you lighting, command control, sound, and accessory hookups. Both male and female sides have enough wire attached to give you the ability to extend your power source. Each unit has a firm fit and a trouble free discount. All micro mini connectors, as well as the wires, have polarity markings, for use as an indicator when necessary. The markings help make sure you do not reverse polarity when you reconnect. At time of disconnecting never pull on wires.CAUTION: NOT TO BE USED TO POWER ROLLING STOCK OR OTHER HIGH CURRENT APPLICATIONS.