Cities are always exposed to noise pollution. Noise pollution is so harmful that even the World Health Organization (WHO) has stated that noise pollution is one of the major threats to public health. However, it’s very difficult to manage or control the use of outdoor speakers which cause serious noise pollution. CATCHFLOW offers a directional sound technology that concentrates and sends the sound right where you need it for smart cities and various other areas so that users can more actively manage sounds. CATCHFLOW strives to contribute to reducing noise pollution by allowing the users to not only control the volume but also to separate the sound resources for information purposes from urban environmental noises for more systematic management and design of sound resources.