D'Addario Tuner Eclipse Rechargeable PW-CT-27 guitar tuner with built-in battery

The Rechargeable Eclipse Headstock guitar tuner provides up to 24 hours of tuning on a single charge. Using the included USB cable, simply plug the device into any USB port to recharge. The Eclipse tuner continues to offer fast tuning, an ultra-bright LCD display, and auto-off, plus no need to replace batteries. Easily clips onto the headstock of your guitar—classical, acoustic, electric, or bass.