A portable electronic device may have a dock connector moisture infiltration indication structure for indicating whether moisture has infiltrated the device. The structure may be located within a dock connector port. The dock connector may have a viewing hole that enables viewing of the moisture indicator. The moisture indicator may have four layers: upper and lower moisture barriers, a wicking layer and a dyeing layer. After becoming wet, the moisture indicator may change from one color to another color. A menu button in the device may have a transparent and opaque member with a viewing aperture. A moisture indicator may be formed on the button and may be viewed through the viewing aperture.