There are DAF apps for the Iphone and Android. They're usually $10 or $20, so no need to spend $1k+ on a little flimsy machine. This device is great for PRACTICE. Whenever I use it in a real world situation it may help me for a minute or 2 but then the "feeling" wears off. Use it to practice slowing down your rate of speech. Use it to practice prolonging your words.