Product Details: Guitar Accessories... KORG Korg Chromatic CA-30 Tuner, Black, Used. Product Dimensions (Length x Width x Height): 6.4cm (D) x 10.4cm (W) x 1.5 cm (H), Weight: 81g (including batteries), Battery Life: Approximately 100 hours, Instruction manual included, No warranty. Manufacturer: Korg Inc. The product is in good condition and is a clean used item. (There are fine scratches on the main unit and screen. Please check the photos.) However, there are no problems in normal use. Recommended for those who are starting to learn music. Please check and judge based on the images posted as this is a used item. Please note that the color of the product may appear slightly different from the actual color. Please forgive any minor scratches or stains that could not be captured in the images. We have not checked for any content not mentioned in the product condition. We indicate the condition if there is a significant feeling of use, such as if there is an impediment to playing. Please refer to the manufacturer's website, catalog, etc. for product specifications and details. Thank you for viewing. In addition to guitars and basses, it can also be used for wind instruments, etc., as a microphone is built-in. 【Specifications】 Temperament: 12-tone equal temperament Measurement Range: C1 (32.70Hz) ~ C8 (4186.01Hz): Sine wave Reference Tone: C4 (261.63Hz) ~ C5 (523.25Hz) 1 octave Tuning Modes: METER (AUTO), SOUND (MANUAL) Calibration Range: A4 = 410-480Hz Measurement Accuracy: Within ±1 cent Sound Accuracy: Within ±1.5 cents Connectors: INPUT (6.3 mono standard jack) Batteries: 2 AAA batteries 3V Battery Life: Approximately 100 hours (manganese batteries, meter mode, A4 continuous input) (Quoted from the internet.)