Conductors: 30 cores， support for ipad 5 in 1 card reader， data transfer and charging can， HDMI VGA and so can 

Role: You can connect with some Apple accessories， such as speakers， dock， external batteries， as some base if the machine sets the protective shell， you could not get down， and this can help to prolong your head. 

 

 

With this extension of the head， it would not have removed the cap. Easy!