MMUSS Adjustable Wireless Bluetooth Baseball Cap Music Cap Sports Sun Hat with Headset Phone Call Answer Hands-free for iPhone Android (Denim) Built-in Mic and stereo speaker, available for cell phone to transmit the speaking phone to your audio devices directly so that the user can answering phone Hands-free speaker will allow you to listen to music and talk while doing variety of other activities headphone speakers built right in to the stylish design of a hat. Wear the hat, nobody will ever know that where the music is coming from Easily compatible with an iPhone, iPod, Galaxy, Blackberry, Android, Etc. Perfect for traveling, waiting for the bus, jogs in the cold or just rocking out in your bedroom