Korg, the company that invented the first hand held electronic tuner, has now created the world's smallest digital metronome. The Korg MM-1, an on-ear micro metronome, is only slightly larger than an earring, but packs all the functionality you could want for rhythm training.

MPN: MM-1
UPC: 603384026972

• World's smallest and lightest micro metronome
  
• Unique design, there is nothing else like it!
  
• Digital accuracy and everything you need for complete rhythm training
  
• Fits comfortably on your ear - only you can hear it
  
• Micro metronome sets tempos over a range of 40 - 208 bpm
  
• Various time signatures - 1/4, 2/4, 3/4, 4/4, 5/4, 6/4, and 7/4
  
• Duplet, triplet, and quadruplet beats
  
• Long-life lithium battery for wireless use (battery life 500 hours)
  
• Dimensions: .64" wide x 1.83" deep x .66" high
  
• Weight: 0.2 oz