dearDigital Tuner LED Digital Electronic Acoustic Bass Guitar Chromatic Tuner with Mic Features: Guitar, bass or chromatic tuner. Small and exquisite appearance, it is convenient to carry. Colorful LED indicator light, excellent visibility. Auto string tuner, modify tone accurately and fast. Energy-saving, it will be automatically powered off after no operation for 3 minutes. Has memory storage function, last operated function will be displayed when machine is turned on again. Specifications: Color: Black Pick : Mic or Clip Tuning mode: Automatic Tuning : A0(27.5Hz)~A6(1760Hz) A4 frequency: 435~445Hz Tuning error: ±1 cent Power supply: 2 * AAA batteries (not include) Item size: 9.5*6*1.5cm / 3.8*2.4*0.6in Item weight: 56g / 2oz Package size: 11*6*2.2cm / 4.3*2.4*0.9in Package weight: 67g / 2.36oz Package includes: 1 * Electronic Tuner 1 * User Manual