D'Addario Eclipse Rechargeable Clamp Tuner

The Eclipse rechargeable clip-on tuner offers up to 24 hours of use per charge. To recharge, simply plug the supplied USB cable into a free USB port. This new Eclipse tuner rotates on several axes and still boasts an ultra-bright LCD display and auto shut-off function, but you'll never need to replace its batteries again.
Specifications:
24 hours use per charge.
Rechargeable.
Ultra-bright LCD display.
USB cable included.