This may look like a novelty product, but a Swedish entrepreneur has raised a lot of money for a similiar idea (although not as focussed as texting your mum). <a href="http://www.theappguy.co/the-app-guy-podcast/2014/11/24/tagp185-joacim-westlund-digital-internet-of-things-business-ideas-sweden-indiegogo" rel="nofollow">http://www.theappguy.co/the-app-guy-podcast/2014/11/24/tagp1...</a>
This is quality! I nearly always forget to text my mum when I've got home from a long journey. One slap of this button when walking through the door, done!