Joyiqi Bicycle Portable Rechargeable Wireless Bluetooth Speaker, Cycling Speaker Mp3 Player with Micro Sd Card and Aux Inputs, with 4 Interchangeable Colored Skins and Bike Mount, for Smart Phone and Tablet Play music via bluetooth, MicroSD card or AUX line! Enjoy perfect sound anywhere anytime! 10 hours(50% volume) working time, buit-in 820mAH rechargeable battery! 4 colored skins and matching bicycle mount included! Light and small very easy to install, new design add microphone for picking up calls!