Chromatic tuner pedal for electric, acoustic guitar and bass. Innovative mini pedal tuner,small size Adjustable A4 range:430-449 Hz Universal 9V effect power supply Bright LED display for reading the tuning information easily. Mute tuning,you can choose whether to block the signal output in tuning Tuning Range: A0(27.5Hz)-C8(4186Hz) Tuning mode: Chromatic Response time:Less than 10ms Tuning accuracy: 0.5cent Power Supply: DC 9V(not included) Colour:black Material:Metal Package Contents: 1 x Pedal Tuner 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.