An electrical connector for mounting to a flexible substrate and for coupling with a mating connector having a low-profile. The connector comprises a cover portion arranged to extend in a plane parallel to the substrate so as to cover a mounting hole in the substrate. The connector further comprises a body portion comprising a connection port projecting from the cover portion, the connection port having electrical contacts within an end face of the port. The body portion further comprising an alignment collar arranged circumferentially around the connection port, the alignment collar being provided with an alignment feature at a discrete circumferential position for angularly aligning the mating connector with respect to the connection port.