This is an MP3 player UI that features a “one button motion interface”, performing different functions according to the direction of the device when the button is pushed down. The interface uses one button and a three axis sensor (applied for a global patent). When the user pushes down on one button, the three axis sensor detects the product's direction, resulting in the execution of a function according to the direction. By shaking the product, the user can access voice information on a song's title or switch to play mode. An interesting, easy user experience is offered through this new UI that is based on a simple combination.