For some fun, it isa transparent metronome. See and enjoy the mechanism! It is great for finding the tempo and understanding how a metronome functions.

Specifications

• tempo range: 40 – 208 beats / min.
• bell: 2, 3, 4, 6
• weight: 486 g
• dimensions: 11.0 20.7 11.7 cm | 4.33 8.15 4.61 inches
• attachment: Front Cover
• power: Spring | No Battery
• origin: MADE IN JAPAN