A housing assembly , comprising: a housing , defining a mounting groove ; and an engaging member , arranged in the mounting groove and capable of moving relative to the housing , wherein the engaging member is configured to move to provide an avoidance space for a connector to be inserted into or removed from the mounting groove ; during the movement of the connector from a first position to a second position in the mounting groove , the engaging member is configured to move within a limited position and restore to engage with the connector , wherein the movement of the engaging member is a linear movement, the moving direction of the engaging member is different from the inserting direction or removing direction of the connector , the mounting groove comprises a first mounting groove and a second mounting groove connecting with each other, the first mounting groove has a first opening and the second mounting groove has a second opening , the housing comprises a plurality of side faces connected to each other, the first opening is defined in one of the side faces , and the second opening is defined in an adjacent side face of the housing , characterized in that , the housing defines a sink , the first opening is defined by a bottom wall of the sink ; the housing assembly further comprises a baffle whose shape matches the shape of the sink ; the baffle is mounted in the sink , the baffle defines a through hole through which the connector passes; a thickness of the baffle is less than a depth of the sink , and an accommodating space is formed at a side of the baffle away from the bottom wall of the sink , the accommodating space is configured to accommodate a part of the connector . a housing , defining a mounting groove ; and an engaging member , arranged in the mounting groove and capable of moving relative to the housing , wherein the engaging member is configured to move to provide an avoidance space for a connector to be inserted into or removed from the mounting groove ; during the movement of the connector from a first position to a second position in the mounting groove , the engaging member is configured to move within a limited position and restore to engage with the connector , wherein the movement of the engaging member is a linear movement, the moving direction of the engaging member is different from the inserting direction or removing direction of the connector , the mounting groove comprises a first mounting groove and a second mounting groove connecting with each other, the first mounting groove has a first opening and the second mounting groove has a second opening , the housing comprises a plurality of side faces connected to each other, the first opening is defined in one of the side faces , and the second opening is defined in an adjacent side face of the housing , characterized in that , the housing defines a sink , the first opening is defined by a bottom wall of the sink ; the housing assembly further comprises a baffle whose shape matches the shape of the sink ; the baffle is mounted in the sink , the baffle defines a through hole through which the connector passes; a thickness of the baffle is less than a depth of the sink , and an accommodating space is formed at a side of the baffle away from the bottom wall of the sink , the accommodating space is configured to accommodate a part of the connector . <EOS>