Shruti Box in 432 or 440 hertz from 'Ligner', 1 octave row from C3 to C4, a pure fundamental tone instrument. 41 × 32 × 8.50 cm - 4.50 kg. Sold with its bag!

It works like a small harmonium without keys.

You can create a powerful continuous tone or chord on it. The sound is similar to that of an accordion.

All semitones from c to c' can be activated individually.

A sturdy fabric bag is included. 13 tones from C3 to C4

The shruti-box or surpeti is an Indian free-reed musical instrument. It is a singing guide with variable drones operated by a hand-operated bellows, like a keyboard-less harmonium. An electronic version is also available.
Bill
A leather or cardboard bellows is attached to a rectangular wooden sound box.

Air escapes through several simple brass reeds (between 4 and 16) that can be opened or closed as desired. The air must be pumped by hand by operating the bellows. There is also a mute.

Game
It is a study instrument, of modest volume and price, which replaces a tampura, a harmonium, or a shehnai or nâgasvaram drone.

It is also sometimes found in concerts alongside the tampura.