Within a certain price range free samples are available
All India
Product Description
White Noise Machines
Real-Time Adaptive Adjustment Features Control of masking volume based on the level of disturbing noise in a room.
Disturbing noise is measured using sound level sensors installed in the ceiling.
Masking sound level is adusted automatically in real-time.
Adjustment rate, high limit and low limit are programmable separately, for each zone.An input mixer allows for the combination of any active input with output channel.