This is simple electronic sruthi box for musician 

Frequency Range:                   82 to 164  variable with a rotary pot

                                                ( Octave 2, E2 to  E3 )

Notes                                       Lower Sa and Pa

Output Volume                       Adjustable by a Knob

Power                                      Built-in Battery ( Rechargeable with  cellphone charger)

                                                ( 12 Hours of continuous use )