Cherub rechargeable digital tuner- WST-675.

• Note Key Function : When the device is in G (Guitar) tuning mode, short press the back button to switch in between the altermate guitar tunings (DROP D, OPEN G, OPEN D, OPEN E) and flat tuning (b, bb).
• Tuning Range: A0(27.5Hz)~C8(4186Hz),Flat Tuning: B-Bb-Bbb.Tuning Modes: Chromatic, Guitar, Bass, Ukulele, Baritone.
• Built-in rechargeable battery allows up to 10 hours of continuous use per charge.
• High contrast color display with strong and flexible clip for the best viewing angle.Auto power off function for maximum battery life.
• Operate it after you read the Instruction Manual