Bluetooth receiver, NUTK Wireless Bluetooth Audio Speaker hi fi Stereo Hi-Fi Audio HeadsetLossless Adapter Simply connect your smartphone or tablet PC to Bluetooth adapter and connect. Runs for an extended period of up to 10 hours on a full charge. No interruptions, no problems. This is Bluetooth receiver to have a 300mAh battery,allowing it to provide up to 10 hours of continuous quality music playback for car systems, home theaters, smart phones, and tablets. NUTK have greater depth, a stronger infrastructure and pioneering technology to deliver even better solutions to you. we are proud to help you bring reliable, affordable, sustainable product to consumers around the world. please see more click NUTK