An apparatus comprising: a connector for providing an electrical interface, the connector comprising an opening configured to receive a suitable member; at least one conductive contact located at least partially within the connector and configured to operate as a switch such that when the connector is in an unplugged to partially plugged state the at least one conductive contact is grounded and when the connector is in a partially plugged to a fully plugged state the at least one conductive contact is coupled to an electrical terminal channel interfacing an electrical signal between the connector and the member.