Seiko SMP-20 combination digital tuner & digital metronome. The Seiko metronome & tuner in one is a chromatic digital electronic tuner for perfect pitch tuning of instruments, combined with a strict tempo digital electronic metronome.

Electronic digital metronomes for music practice with metronome timekeeping.

SMP20 SPECIFICATIONS
• Mode: Auto Chromatic
• Tuning Range: Chromatic B0 – B7
• Pitch Shift: 438– 445Hz
• Tempo Range: 35 – 250 (221 steps)
• Tempo sound: Beeping sound
• Indicators: VU-Meter (LED illumination), 2 LEDs/ Tuning guide, 8 LEDs/Tempo indication/Note indication, LCD/Mode indication, Pitch indication.
• Terminal: Built-in microphone, AC adaptor jack (DC 9V)
• Input: 6.3mm (1/4") jack socket
• Output: 6.3mm (1/4") jack socket 
• Power: 9V dry battery, DC9V power supply