Had to buy this just cause I've never seen one before.
Press the button to remove the heads.
(http://imageshack.us/a/img855/3985/001pma.jpg)
(http://imageshack.us/a/img21/1633/002dyb.jpg)
(http://imageshack.us/a/img13/633/003cpv.jpg)
That is too cool, another one I want