The metal wheels on the swivel mechanism of this cell phone holder shaker have been improved to ensure quiet operation . This cell phone shaker also has a simple design to make it easier for you to use. It can hold two cell phones on its carrier board, which can be attached with rubber bands .
Last but not least, it can be powered in two ways: USB cable or four AA batteries , whichever is more convenient for you. A bonus of this device is that you can shake the ball to take 7,000 steps per hour .