HF sound quality. True wireless stereo. Comfortable to wear. Specification: Type-C. Wireless connection version: 5.3. Wireless transmission distance: > 10 m. Battery capacity: 35mAh. Charging case battery capacity: 400mAh. Music time: About 6hrs. Talking time: About 3hrs. Charging time: 1hrs. Standby time: 720hrs. Input: 5V=1A.