For the blind, there are voice output systems. These were attributed to personal computers and personal electronic devices. The specific technologies this system can be found on are Windows, Mac, and Android. The voice output system has been of great help to the blind and visually impaired. Speech synthesizers placed in computers are capable of reading textual information displayed on the screen. This allows the individual to use these devices, even if they cannot physically see what is on the screen. The user can send a command to the computer by pressing different keys on the keyboard. Synthesizers can also tell you where the cursor is. For these output systems to work effectively, The Future of Disability in America states that "computer screen readers require appropriate design of what appears on the screen." This means that the computer must not only read printed text, but also text found on images and text labels found on graphics. There are also accessible entry systems. Voice recognition systems allow the individual to speak to the computer and it will enter what they say. These input systems are regularly seen today with the iPhone. These phones include an intelligent assistant named Siri that can answer any spoken questions asked of it. It's systems like these that make it easier for blind people to use technology. Blind people and other people with different types of disabilities can now freely use these devices thanks to this system.