The D'Addario Nexxus 360? rechargeable tuner lets you tune quickly and accurately, while avoiding the cost and hassle associated with battery replacement. Its discreet, easy-to-hang design includes an ultra-bright LED color display capable of 360° rotation to give you optimum readability and clarity, whatever the ambient light. Simply plug the supplied USB cable into a device equipped with USB power ports to recharge the tuner, and enjoy 24 hours of use per charge.