Unused item. As I am not a retailer, I will answer questions about specifications to the best of my ability. ⸻ ・Features Active Noise Canceling (ANC) for high immersion even in noisy environments. ・Equipped with 40mm drivers, delivering a well-balanced reproduction of deep bass and clear mid-high frequencies. ・Bluetooth 5.4 technology improves connection stability, reducing sound skipping and latency. ・Clear voice calls are possible with the built-in microphone, supporting hands-free calls. ・Supports multi-point connection, allowing simultaneous connection to two devices. ・Supports both wired and wireless modes, allowing use depending on the application (*ANC function is disabled when wired). ・Up to 80 hours of continuous playback (normal mode) / up to 30 hours (ANC mode). ・Full charge in approximately 2 hours via Type-C port. ・Multi-function button allows for on-the-fly control of playback, pause, and track skipping. ・Closed-back over-ear type with high sound insulation, preventing sound leakage. ・Soft and lightweight ear cushions maintain comfortable wear even for extended use. ・Suitable for various uses such as watching movies, gaming, commuting to school, and web conferences.