Disclosed is a wireless audio device, which includes at least one microphone, at least one speaker, at least one sensor, a processor, and a memory storing instructions, and the instructions that, when executed by the processor, cause the wireless audio device, while the wireless audio device outputs a sound for reducing an outside sound acquired through the at least one microphone through the at least one speaker, to identify a specified outside sound of the outside sound acquired through the at least one microphone, to output a notification sound for indicating that the specified outside sound is identified through the at least one speaker, to identify a motion of a user of the wireless audio device through the at least one sensor, in response to outputting the notification sound, and to stop the output of the sound for reducing the outside sound based on the identified motion.