Wireless audio output device and operation method thereof

An operation method for a wireless audio output device, the wireless audio output device comprising a plurality of audio output units, a first audio output unit among the audio output units being set as a first role and one of a plurality of second audio output units among the audio output units being set as a second role and another of the plurality of second audio output units being set as a third role, and the operation method comprising:

• establishing a multicast link with a source device by the first role to receive one or more media packets from the source device on the multicast link, and to perform bidirectional communication with the source device;
• joining the multicast link by the second role and the third role to receive the one or more media packets from the source device on the multicast link, to perform unidirectional communication with the source device, and to perform unidirectional and/or bidirectional communication with the first role,
• wherein an extended packet time slot is divided, the first role transmits a first extended packet to the second role and the third role during the extended packet time slot, the second role and the third role transmit a second extended packet and a third extended packet to the first role respectively in different timing of the extended packet time slot.