The WST-640G/C/U AutomaticGuitar Tuner makesguitar tuning a breeze? thanks to its versatile design. The gorgeous tuner includes a high-sensitive vibration sensor and a sturdy clip that goes onto the headstock. It is easy to use. Make the tuner stand to power it on. And when it lies down or there¨s no signal input? the tuner will automatically power off. The large backlit screen display gives you even more visibility when you need it most. Don¨t hesitate to get one now!                                    Features             Versatile design makes guitar tuning a breeze<br> Include a high-sensitive vibration sensor and a sturdy clip<br> Easy to use? no complicated buttons<br> Power on automatically when it stands up<br> Power off automatically when it lies down or there¨s no signal input<br> Large backlit screen display for more visibility<br> Compact? lightweight design for portability<br> High accuracy? reliable for beginners and professionals <br>                                                            Specifications             Color     Black    <br> Dimensions     (1.69 x 0.98 x 1.26)" / (4.3 x 2.5 x 3.2)cm (L x W x H)    <br> Weight     0.81oz / 23g    <br> Tuning Range     A0[27.5 Hz] ~ C8[4186 Hz]    <br> Tuning Mode     Guitar    <br> A4 Range     440Hz    <br> Accuracy     ＼1 cent    <br> Tuning Method     Auto    <br> Power Supply     3V(CR2032) Lithium Battery    <br> Model     WST-640G/ C/ U     <br>                                                             Package Includes            1 x Guitar Tuner<br>1 x Manual<br>1 x Battery<br>