LeapFrog Learn to Write with Mr. Pencil Stylus & Writing App (works with iPhone 4/4s/5, iPod touch 4G & iPad) Learn to Write with Mr. Pencil is an engaging app toy that teaches writing letters, numbers and shapes through interactive games and activities. The included Mr. Pencil app and Mr. Pencil stylus work together with an iPhone, iPod touch or iPad (sold separately) to create a learn-to-write tool. This special included app helps teach letters, numbers and shapes with a unique stylus that won't scratch device screens. Teaches upper- and lowercase letters, numbers 1-20 and basic shapes. The app saves your child's writing as he/she plays the so you can view progress. Ages 3-6 years.