Innovative suction cup tuner,Bring a new tuning experience to help you realize your dream of playing Flexible tuning from multiple angles,Keep the headstock beautiful and prevent wear and tear on the instrument High precision 1 cent error,Accurate pitch makes the piano sound better Twelve equal temperament patterns,Universal musical instrument, widely applicable Long battery life thanks to button cell batteries,Built-in power saving function to lock the power Product model:ST-730 Tuning range:A(27.5Hz)-C(4186Hz) Screen:LED color LCD display A4 range:440Hz Tuning mode:law of twelve equals Tuning accuracy:1 tone Tuning method:Automatic Battery:3V (CR2032) The product appearance and printed words may vary depending on the batch, but this does not affect use. Colour:Black & White Material:ABS Package Contents: 1 * Clip-on 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.