19762Screw-on/stick-on automatic mini tuner for guitar & bass - normal, sharp & flat tuning - built-in vibration sensor - auto power-off - 3V button-cell battery (CR2032) included - Fastening material: double-sided 3M tape and screws, included - Dim.(W*D*H): 3*4*1 cm/ 1.18*1.57*0.4 inch - Weight (w/ battery): 11g/ 0.39 oz