Yesido YSP28 ENC Noise Reduction Ear-hook Open OWS Bluetooth Earphone Features 1. ENC Intelligent Noise Cancellation: Precisely filters ambient noise for clear and smooth calls, making meetings more efficient. 2. Titanium diaphragm speaker, HiFi sound quality: 12mm titanium diaphragm speaker with open acoustic design restores a natural, wide soundstage. 3. Bluetooth 5.4 high-speed transmission: Low-latency, stable connection, and narrow-band directional sound transmission technology ensure call privacy and security. 4. Adaptive memory ear hook: Flexible ear hooks conform to the shape of the ear for a secure and comfortable fit, and resist falling off during exercise. 5. Open and secure listening: Transparent soundstage design allows you to listen to music while being aware of ambient sound, providing peace of mind when traveling. Specifications 1. Bluetooth solution: Bluetrum 5656C3 V5.4 2. Speaker specifications: 12mm diameter, 32 ohm 3. Battery capacity: 450mAh polymer battery 4. Headphone battery capacity: 50mAh 5. Material: ABS+PC 6. Music playback time: Approximately 6 hours 7. Interface: USB-C 8. Effective range: 10 meters 9. Power: 10 mW 10. Charging Time: Approximately 20 minutes for earbuds, approximately 1.5 hours for the charging case