Don’t worry about cords or Bluetooth and amplify sound from most phones and mp3 players with the Beat Box Induction speaker. Each of these ABS plastic universal induction speaker/amplifiers picks up the vibration of your phone to amplify the sound wirelessly. Simply place your device on top of the speaker! An included USB cable powers the device, or you can use 2 AAA batteries (not included). An on/off button lets you conserve batteries when not in use. They’re individually boxed in retail packaging.