One of the most popular electronic metronomes. Made by Seiko, this inexpensive, high quality unit will give years of service. Features two different solid "tock" sounds and a large flashing LED. Rotary dial allows quick tempo changes (40 to 208 BPM) or selection of the A=400 or Bb tuning pitches, something not available on cheaper push-button models. Uses one standard 9 volt battery (included).