This is a set of E-flite EC3 device and battery connectors. This set contains one female and one male connector. E-flite's high-quality EC3 connectors and leads should be a staple for every workbench. EC3 (E-flite Connector 3.5mm) connectors, leads with connectors, and accessories are perfect for electric power applications and work with any battery, charger, ESC, Power Meter, etc.