Dreampad Bluetooth Receiver, Portable Wireless Audio Adapter 3.5 mm Stereo Output (Bluetooth 4.1 and Built-in Microphone) for use with a Dreampad Pillow Bluetooth Receiver works with any Dreampad Pillow Wirelessly stream your own playlist Music delivered through bone conducting technology Just-for-you sounds wont disturb others Bluetooth receiver is an easy add-on to the pillow