Features: Simple and up-to-date design convenient to carry. Small compact product size two buttons operation. Clip-on design with large opening for easily fixing on instrument. Bright TFT color screen display accurate and fast tuning with dynamic display. Dual 360 degrees & 180 degrees rotatable clip for best viewing angle. Built-in rechargeable battery quickly charges with included cable. 3 minutes auto -off function saves energy. Tuning items including guitar cello saxophone trumpet etc. Specifications: Material: ABS Tuning Item: Chromatic Tuning Note: A A# B C C# D D# E F F# G G# Detection : A0(27.5Hz)~C8(4186.00Hz) A4 Frequency : 410~460Hz Tuning Cents Indicator : -50~50 cent Tuning Accuracy: ±0.5 cent Supply: Built-in rechargeable battery Battery: 3.7V 90mAh Charging Time: Approx. 1.5 hours Duration: Approx. 3 hours Auto-off: 3 minutes Charging Voltage: USB 5V Item Weight: 18g / 0.641oz Package Weight: 47g / 1.67oz Package Size: 11.5 * 6 * 3.3cm / 4.53 * 2.36 * 1.30in Package List: 1 * Tuner 1 * Charging Cable