A connector (100) and connector system are provided. A connector can include a domed metal switch (102) that is partially covered with a liquid impermeable barrier (101) such that a portion of the domed metal switch is exposed and the liquid impermeable barrier is coupled to the domed metal switch with a liquid impermeable junction (221). In a connector system, a complementary connector can include a dome switch actuator (706,707), partially covered with another liquid impermeable barrier. When pressed against the connector, the domed metal switch can deform to contact an electrical conductor (104). A control circuit (1309) can determine whether an electronic device or user is causing the deformation by detecting whether voltage or current is applied to the domed metal switch while deformed.