The AVANTEK White Noise Machine comes with 20 soothing sounds: 6 types of white noise, 6 fan sounds, 8 nature sounds including ocean waves, rain, wind, stream, birds, campfire, cricket and clock. All the sounds played by this machine are crisp, natural, realistic, and free of scratches, which helps you block out distractions, creating an environment ideal for sleep, relaxation and concentration on study or work.