QR Voice for is a web tool that allows you to create QR codes that when scanned will play a short audio message. QR Voice is very easy to use . To create your own QR code you just need to press on the microphone icon in the empty bar and record your audio message . You can also type in your message if you don't feel like recording your voice and in either way you are allowed just 100 characters.
Head over to QR Voice and give it a try