If you have an old Android phone or tablet that needs a good use, Dormi is a new app that turns your old devices into smart baby monitors or remote speakers you can use to keep tabs on the little one, or just keep remote ears in different rooms around your house. Dormi is technically a subscription-based app, but a one-time fee of $7 lets you use as many monitors for as long as you want, indefinitely, so it’s really just $7.