JUYO VONSAN electronic portable guitar Metronome and Tone Generator WSM-240 &hellip; 1.Metronome and Tone Generator 2.Measure indicator makes practice easier 3.Pre-beat (up beat) function gets the player ready to start the song. 4.Using encoder to control speed makes the operation simpler and faster. 5.Auto-off function. The machine will automatically turn off if there is no operation for 5 minutes.