The SparkFun VoiceBox Shield adds all the capabilities of the SpeakJet voice and sound synthesizer to your Arduino Project via serial commands.
Small electret microphone. Useful in acoustic and audio applications, voice recordings.
Think of this as a audial robotic digestive system. It'll eat 20 whole seconds of sound before barking it back at you with beautiful clarity, maybe not exactly as you remember it but pretty close!
Yes, there are other music/mp3 shield out there, but SEEEDStudio does it again with a very complete unit!