The tempo range is 40-208bpm, and a tuning reference tone is included. Also features a choice of internal speaker or headphone listening. Key Features: - Tempo range: 40 – 208 (39 steps) - Tone generation: A4 = 440Hz Bb4=466.16Hz - Terminal: earphone jack - Tempo sound: Two different tones - Terminal: earphone jack - Power: 9V dry battery