This is a clip-on tuner with the Martin logo. An English instruction manual is included. It can be used for guitar, bass, ukulele, and violin, and is easy to use with its chromatic function. It uses a CR2032 battery, which must be purchased separately. - Accurate tuning (with cent display) - High-definition screen - Adjustable pitch (430Hz-450Hz) The price has been reduced because there is no box. It is a relatively clean item as shown in the photos, but as it is a used item, please refrain from purchasing if you are sensitive or looking for perfection. Please note that this is a no-claim, no-return (NC&NR) sale.