A clip-on digital tuner with a touch screen. This device is USB rechargeable and cord is included. Fully charges in 1-2 hours, should be good for up to 20 hours of operation. Auto turn-off. The large, intuitive, back-lit display makes for easy readability. Chromatic, with guitar, bass, and ukulele options. The Cool Smart Touch Tuner is fast, very accurate, and easy to use.