A portable electronic device includes a housing, a display at least partially within the housing, and a front cover and rear cover coupled to the housing. The rear cover defines a first portion of a rear exterior surface of the portable electronic device, a protrusion defining a sensor array region of the rear cover and a second portion of the rear exterior surface, and an internal surface opposite the second portion of the rear exterior surface. The portable electronic device also includes a sensor array mounted within the housing along the sensor array region and comprising a frame member coupled to the rear cover, a camera module positioned in the first container region, and a depth sensor module positioned in the second container region and attached to the internal surface of the rear cover.