Set of 1 x male and 1 x female connectors with cable covers.  The male connector is a standard XT90 while the female is an XT90S.

The XT90S incorporates inrush spark suppression by initially placing a 5.6 ohm resistor in circuit, when the connector as the connectors are plugged together,  to limit current.  When the connectors are fully seated, the resistor is bypassed.  The green colouring on the female connector highlights that it is a spark suppression version.