The Addaock is a portable door lock that installs in seconds without any tools required. The Addalock is a portable door lock that gives you additional safety, security and privacy. Use it at home or take it with you when you travel, apartment living, hotel students, school lock down The Addalock is great if you are staying at a B'N'B or any other short term rental The Addalock is a portable door lock that can be easily installed and removed in seconds on any door that open inwards, giving you additional safety, security and privacy behind it. Use it on the front door of your home and take one with you when you travel. The Addalock can be used when staying in a hotel, a BNB or any other short term rental. Great for students away at college and for those same colleges and schools to use as an affordable option for their safety lock downs.