Features: 1.Accurate Tuning: Featuring an extremely precise piezoelectric sensor, it detects the vibrations of your instrument by direct contact and tunes it accurately in an instant without interference from ambient sound. 2.Wide Calibration Range: Rechargeable clip on tuner with a calibration range of 410?460Hz, it is suitable for various musical instruments. 3.HD TFT Screen: Clip on tuner features a HD TFT screen that smoothly displays the tuning process. There's no need to worry about using this tuner in the sun or under the glare of the stage. 4.360 Degree Rotatable Clip: Rechargeable clip on tuner features a 360 degree rotatable clip so you can place the screen just the way you like it. 5.Compact and Portable: Rechargeable clip on tuner is well designed and small enough to fit in your pocket or at the end of your guitar case. specification:Item Type: Clip On Tuner Material: ABS Calibration Range: 410-460Hz Comes with Built in Battery Battery Model: 3.7V Lithium Battery x 1 Battery Capacity: 90mAh PackageList:1 x Clip On Tuner 1 x USB Charging Cable 1 x User Manual