Features:
Mechanical metronome universal for guitar， piano， violin etc， to help beginner have better rhythm.
Precision spring and top grade metal mechanism.
High accuracy， tempo error is less than 1%.
Variable tempo from 40 to 208 bpm.
5 optional downbeat: 0， 2， 3， 4， 6.
Powered by winding mechanism， no requirement of battery.  
ABS plastic with teak polished finish， transparent protective casing.
It is a great assistant for novices.

Specifications:
Color: Natural wood
Material: ABS
Tempo range: 40-208bpm
Beat: 0， 2， 3， 4， 6
Tempo error: ＜1%
Power: Winding mechanism
Product size: Approx. 10 * 10 * 20cm / 4 * 4 * 8in
Product weight: 474g / 16.7oz
Package size: 24.5 * 12 * 12 / 9.6 * 4.7 * 4.7in
Package weight: 610g / 21.5oz

Package List:
1 * Metronome