Model:WST-523 Name:Auto Tuner Specification■ Items of tuningkeys tuning:C、F、Bb、EbMusical tuning:G(Guitar),B(Bass),V(violin)■ Tuning range:A0(27.5Hz)~a3(1760Hz)■ Tuning mode:Auto tuning■ Battery:3V(CR2032 button cell battery 1 piece)