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:
3C# 3Eb 3F# 3G# 3Bb
3C 3D 3E 3F 3G 3A 3B 4C