This lock is very very dangerous. If dead locked then occupants will not be able to get out. In the case of a fire they will be burned. If your flat mate deadlocks it then you will have an enforced day off work!
I repeat this is a very very bad product. Do not buy it.
BUT and it is a BIG BUT. No support for IMAP emails. Without this it is unusable for me.
Please don't tell me GMAIL has this functionality, it doesn't. What I want is a way of reading and replying to my emails like I can on my office computer, my laptop and my android tablet. Should have bought a netbook.