"Smart"? deadbolt

Hello all, Does anyone have any kind of experience with the new smart deadbolts available on ebay (http://www.ebay.com/itm/270985910126?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649)?
Sold around 50$ and have some kind of 2 inputs for "lock-opening signal" and open/close sensor.