Abstract: A speaker is provided. The speaker may include: a sensor adapted to sensing object movement within its sensing range; and a processing device configured to generate a volume control instruction if the sensor senses one of the following movements of an object: movement away from the first sensor, and movement towards the first sensor. More intuitive and easy-to-understand ways to control playback of the media player may be achieved.

Abstract: An earphone and a media player system are provided. The earphone may include: a first sensor unit and a second sensor unit respectively mounted on a left portion and a right portion of the earphone, adapted to sensing gestures and generating signals according to the sensed gestures, where the left portion and the right portion are disposed on two sides of a user's head when the user wears the earphone; a processing device, adapted to translating the signals into control instructions to control a media player; and an interface, adapted to transmitting the control instructions to the media player. Unintended operations may be reduced.