This item is 100% authentic. If you have any questions or request about items, please feel free to ask us. [Power, size] Measurement accuracy: ± 0.02 cents Reference pitch change range: 300.0 Hz to 599.9 Hz (0.1 Hz unit) Bypass: True Bypass Power supply: DC9V power supply (center minus) or 9VDC dry cell Power consumption: 48mA Size: 61mm (width) x 112mm (length) x 34mm (height) Weight: 246g Lightweight and sturdy aluminum die-cast body.This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Tuners". The seller is "warmjp" and is located in this country: JP. This item can be shipped to United States, all countries in continental Asia, Australia.