Parameter Information: Battery: 1 x CR2032 Battery Display: Double Colors Backlighting Weight: 97G / 3.42OZ Tuning Range(HZ): A0(27.50Hz) - C8(4186.00Hz) Turning Items: Chromatic / Guitar / Bass / Ukulele / Violin Type: Tuner Product Description: A4 Calibration: 430Hz ~ 450Hz Tuning Accuracy: 0.5 cents (Plus or minus) LED Display Screen: 1.6 Inch Features: - This product is not only a professional capo but also a professional tuner. - Tuner with high sensitivity, more accurate, precise, convenient and rapid. - Made of high grade ABS and zinc alloy material. Operation: - Power On / Off: Press "Power" button, the LCD display turns red initially and the tuner is ready to detect the vibration. - Choose Tuning Items: When power is on, press "Item" to choose the tuning items, which is initially ranging from guitar tuner (G), bass tuner (B), to chromatic tuner (C), or bass tuner (B) mode, the tuning item belongs to string instrument tuning. - A4 Calibration Setting: Press "A4/flat" to increase or decrease the A4 frequency in every 1Hz ranging form 430Hz to 450Hz. - Half note Tuning Setting: Under guitar tuner (G) or bass tuner (B) mode, keep pressing "A4/flat" for 1.5 seconds to choose b bb 3 half notes in sequence, and continue pressing "A4/flat" to exit. Package Weight : 104.0 G / 3.67 Ounces Package Dimensions (L*W*H) : 120*100*20 MM / 4.72*3.94*0.79 Inches Retail Packaging: Yes, Colored Box Package Include: 1 x Guitar Tuner Capo