This is a convenient and compact tuner that ensures both visibility and accuracy. It is a used item. There is some rust on the metal part in the second image, although it is not very noticeable. Please consider this before purchasing. Velcro tape is attached to the back. The following is a quote... SWIFF AUDIO C10 / Compact Pedal Tuner Thanks to the innovative idea of stomping on the LED part, it achieves a size of approximately 4.5cm square. Although the housing is small, the LED part is large, and the bright display ensures good visibility. The switch is reinforced with aluminum, providing excellent durability. ◾️Material / Aluminum ◾️Mode / Chromatic ◾️Range / A0(27.5Hz) - C8(4186Hz) ◾️Accuracy / ±0.5cent ◾️Power / DC9V ◾️Size / 4.2cm x 4.3cm x 4.5cm ◾️Weight / 63g ◾️Accessories / Velcro tape x2 - Instruction manual - Box