The shruti box is a hand-pumped wind instrument which provides a drone for singing or playing other instruments. It can produce a single tone or chords. This shruti box has 13 reeds with 13 side mounted controls and integrated bellows.  It has the following tones: 4C# 4Eb 4F# 4G# 4Bb 4C 4D 4E 4F 4G 4A 4B 5C