BOSS Dr. Beat DB 30 Metronome

This pocket-sized metronome offers nine rhythm types and 24 beat variations, and features a smooth-flowing LCD needle with two bright LEDs for visual tempo assistance. Handles time signatures up to 17 beats per measure. Other helpful functions include Tap Tempo for finding the right pulse fast, internal reference tones (12 semitones), Auto Power Off for optimizing battery life, and headphone output with volume control.