Functionality confirmed. I used it for about an hour before listing it, and it worked normally without any sound interruptions. Even after using it for an hour, the transmitter's LED remained green, and I didn't feel any battery degradation. The transmitter was subject to a recall, but it has been addressed by updating to the latest firmware (photo 7). Both the transmitter and receiver have been updated to the latest firmware. Included items: - Transmitter - Receiver - USB cable - Original charger - Japanese instruction manual