BluNote Portable High-Fidelity Bluetooth Mini-Speaker. High-Quality Audio On-The-Go. Portable High-Fidelity, Compact Bluetooth Audio Speaker. Works with any Bluetooth-enabled device (e.g., smartphone, tablet, etc.); Equipped with A2DP (Advanced Audio Distribution Profile). SPECIAL FEATURE: Expand audio output power by using the (3.5mm) Output port to link to another BluNote or other portable speaker that has an Auxiliary (3.5mm) Input port. Is also a portable speakerphone for making and receiving calls from your Bluetooth-enabled phone/smartphone. Auxiliary 3.5mm analog input for non-Bluetooth audio devices. 3.5mm audio cable included. Built-in Rechargeable Battery. Includes Micro-USB charging cable. 1-Year Warranty.