There are several short videos on the internet to show the problem of the cube tablet, but we want to say is that all our cube products will be tested by our engineer before we send out to make sure that the customers can use it without any problem once they get it. In addition, it comes with 12 months warranty that any question please contact us without hesitation. More detail information you can look at here: http://www.cube-tablet.com/buy-products.html