ACS cowouchov STEREO, Panoramic sound effects. 5.4 Core wireless: Strong internal 'core' is the driving force. Al call noise reduction: like face-to-face communication. Super long standby: up to 20 hours. ACS Stereo ：Restoring Hall of Fame Acoustics. Charging port: type-C. Earphone speaker: Φ13mm 32Ω dynamic copper ring speaker. Earphone battery capacity: 40mAh ｜ Battery capacity: 250mAh. Transmission distance: 10m. Talk time: 4.5h  |  Play time: 5.5h