Powerful Function:Chromatic which is suitable for wide range tuning. Tuning range is A0(12Hz) ~ C8(4186Hz) Easy to read: Deluxe LED display leads clear results of tuning, and display leads clear results of tuning. Fast and Precise: New fast precise strobe mode with +/- 0.1% accuracy. Enjoy your own fun and colorful life. Easy Carry: This tuner pedal has a small size body, light weight, suitable for out side gigs,powered by a DC 9V adapter (not included in this package). Solid Quality: True bypass provide transparent tone, durable and sturdy. SIZE: 95 x 52 x 38mm Color: silver Material: aluminum alloy Easy to Use Connected with power and audio cable. Tuner will go to bypass mode. Press bypass switch to enter tuning mode. Operation shows black when no signature is input, the indicator of solmization and fine tuning will be turned on. The blue indicator in the middle turns on when the tone is accurate. Specification: Range: 12Hz~4186Hz (C8) Power Supply: DC 9V (negative in the center ) Working Current: 90mA Display Instruction: Step the footswitch to into model, the indicator turn on and keep silent. Operation shows -when no signature is input in model, the indicator of solmization and fine tuning will be turned on at the same time. The blue indicator in the middle turns on when the tone is accurate. The signature is bypass and no display on the screen while out of the model. Package Contents: 1 x Guitar Tuner Pedal Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.