Q: What if the screen display "check battery"/ "weak battery"/ "battery low" after inserting fully-charged batteries?
A: Firstly, please install other set of fully charged cells for a try.
Secondly, there is a small cotton like this in the device, please take out of it form the hole with tweezers. Then a screw will be shown, please tighten the screw.

Q: Why the file downloaded from your website can not be open?
A: You should download the Escribe software firstly and then related operation can be continued. And the link is http://www.evolvapor.com/.