The shruti box is a hand-pumped wind instrument which provides a drone for singing or playing with other instruments. It can produce a single tone or chords. These shruti boxes have 13 reeds with 13 side mounted controls and integrated bellows.
Two models available:
The 3C-4C has the following tones:
C3 C#3 D3 D#3 E3 F3 F#3
G3 G#3 A3 A#3 B3 C4
The 4C-5C has the following tones:
C4, C#4, D4, D#4, E4, F4, F#4, G4, G#4, A4, A#4, B4, C5