Abstract: An example acoustic transducer device includes a magnet and a pole plate connected to the magnet. The pole plate includes a nickel-iron alloy having nickel as a principal component. The device further includes a diaphragm movable relative to the pole plate to generate a sound and a coil connected to the diaphragm. The coil is to extend into a gap at the pole plate. The coil is to magnetically interact with a magnetic field provided to the gap by the magnet and the pole plate to drive the diaphragm.

Abstract: Example implementations relate to keyboard keys. In some examples, a key of a keyboard may comprise a magnetic plate, a pole plate located adjacent to the magnetic plate, where a channel through the magnetic plate and the pole plate is located adjacent to a perimeter edge of the magnetic plate and a perimeter edge of the pole plate, a membrane covering the pole plate and the channel, a keycap located on top of the membrane, and a wire coil connected to the keycap and located in the channel.

Abstract: In some examples, an electronic device includes a first housing providing a sealed inner chamber, an electronic component inside the sealed inner chamber, a second housing externally of the first housing, the second housing comprising a first opening and a second opening, and an airflow channel between the first housing and second housing, the airflow channel to direct airflow from the first opening to the second opening through the airflow channel to carry heat away from a surface of the first housing.

Abstract: According to examples, an apparatus may include a chamber having a hole and a microphone unit. The microphone unit may include a first substrate having a first opening aligned with the hole of the chamber, a second substrate positioned with respect to the first substrate to form a gap between the second substrate and the first substrate, the second substrate having a second opening, and a diaphragm housed within the gap formed between the first substrate and the second substrate, in which the first opening is positioned on a first side of the diaphragm and the second opening is positioned on a second side of the diaphragm.