Each button has a state-of-the-art microphone and speaker system, allowing you to record and clearly play back any sound or word you want to teach your learner. * Best Sound Quality: Loud and clear quality audio so you can hear the sound from each button press all the way to the next room. * Record Your Own Voice: Customizable with any language, words or sounds you'd like to teach your learner. * Compact Design: Only 1.9 in (4.8 cm) in diameter means you can fit more buttons in less space. * Works Out of the Box: Get hundreds of playbacks with 3 pre-installed long-lasting LR44/AG13 Alkaline batteries. * Perfect Fit On HexTiles: Use with HexTiles that hold buttons securely to organize words and simplify learning. * For Big & Small Learners: Ultra-easy to press even for smaller learners (requiring only 0.5 lbs of pressure).