New app called Bluelight only work in Oakland and Berkeley(ios only able to download in app store)
APP contain the GPS and just single button touch that police send people to help
Price 20 dollars a year
sources:
http://live105.cbslocal.com/video/3350024-new-mobile-app-speeds-access-to-911-emergency-call-centers/ new app blue light
http://www.abouttty.com/ Disabilities and Hearing