Many toys already include computers. An ‘App Toy’ combines dedicated toy hardware with a smartphone or tablet to create a highly interactive toy. The toy uses sensors built into the smartphone. This can include its microphone, camera and accelerometer, as well as its built-in software for voice recognition. The image displayed on the screen is reflected on a mirror inside the toy and can change, depending on the image recorded by the device’s sensors. Another example allows interaction between 'App Toys' using Bluetooth networking between two smartphones, or a smartphone and a tablet. These toys rely on programs running on the smartphone. Making changes to one of these programs then changes the way that toy works, for example the pitch of a toy dinosaur’s roar can be changed by just editing one number.