Abstract: An electronic device includes a front cover, a circuit board, a plurality of flexible boots, a plurality of microphones, and an abutting mechanism. The front cover includes a plurality of wall portions, a plurality of storage spaces encircled by the wall portions, and a plurality of acoustic openings connecting to the storage spaces. The flexible boots are disposed in the storage spaces. The microphones are mounted on the circuit board and disposed in the boots. The abutting mechanism pushes the circuit board toward the front cover to squeeze the flexible boot.

Abstract: An electronic device comprises a body, a first microphone, and a second microphone. The first microphone is disposed in the body. The second microphone is detachably connected to the body. The first and second microphones constitute a microphone array to receive sound from a predetermined direction when the second microphone is connected to the body.

Abstract: An audio signal input and output apparatus includes a microphone array, a mounting part, and a main body. The mounting part is connected to the microphone array. The main body electrically connects an electronic device and the microphone array. The microphone array sends out a first audio signal through the main body to the electronic device.