The Crystal Cube NFC Tags are powerful tools for automating everyday routines with your Android phone and Windows computer. Using free software available in the Android or Play Store you can easily program a tag to do simultaneous functions. Once you set your task list, writing the tag is a simple tap to the tag you want to program. The options are almost limitless. You can control your PC or your phone. You can send a text that you have arrives or left the office, turn down volume, pull up email and much more.