This is a simple wood knock (kentongan) sound application! Have you ever heard of a wood knock (kentongan)? Wood knock (kentongan) is a traditional tool used in Indonesia to alert people in the surrounding about a danger which the user see coming to the neighborhood by using sound made by hitting a stick into wood tube with a hole. Now with this application, you can use wood knock (kentongan) sound just by downloading into your smartphone! This wood knock (kentongan) sound application can be u