Features: Metronome & Tone Generator Measure indicator makes practice easier Pre-beat (up beat) function gets the player ready to start the song. Vertical metronome (downbeat indicator) gives a more direct view of the beat. Using encoder to control speed makes the operation simpler & faster. Auto-off function. The machine will automatically turn off if there is no operation for 5 minutes. Saves settings upon power-off. Specification:WSM-240 Portable Metronome Tempo range: 30~250bpm Beat: -/4, 1/4, 2/4, 3/4, 4/4, 3/8, 6/8 Rhythm: Tempo precision: ±0.3% Metronome sound: Electronic sound Power supply: 3V (2x AAA)batteries or DC 6 V Dimensions: 70 (W)x 23 (D)x 115 (H)mm Weight: 100g Package Included:1 x Portable Metronome 1 x Manual