The Rechargeable Eclipse Headstock Tuner holds up to 24 hours of tuning time per charge. With the included USB-C cable, simply plug into any USB-C port to charge up. This new Eclipse Tuner still has multi-swivel action, an extra bright LCD display, and auto power-off, but now, you'll never have to change a battery again. With this new rechargeability feature, on top of the full color vertical display and easy to use clip-on functionality, Eclipse provides excellent value to any player.