Runtime miracle. HP launches a slim Windows 8 tablet on the market, which mutates to a full-blown laptop via the keyboard dock, dubbed Envy x2 11. An energy-efficient Atom SoC from Intel not only ensures exceptional battery runtimes, but also modest computing power.
http://www.notebookcheck.net/Review-HP-Envy-x2-11-g000eg-Tablet.87799.0.html
Under Connectivity: does it use sim card or 3G network for internet connection
No, it doesn't. There is WLAN and Bluetooth, but no 3G/4G WWAN.
this will be most success concept in future. only thing is the price .
of course i expect more , i need to play game.
morning go office with tablet & keyboard , at night just plug in 42" FHD LCD TV to enjoy web , game , & movie