Features: 1. The 40mm big speaker delivers real sound and makes your ears impressed 2. Bluetooth 5.0 technology, rhythm wireless, listen to good sound anytime, anywhere 3. Highly recognizable button control, one-handed operation, compact and light, easy to carry 4. Built-in lithium battery 5. With a 3.5mm audio cable, it can be used as a wired headset (when the 3.5mm audio cable is inserted, the Bluetooth is automatically turned off)) Product specifications: 1. Bluetooth version: Bluetooth V5.0 2. Support protocol: A2DP, AVRCP, HSP, HFP 3. Bluetooth distance: more than 10m 4. Working voltage: 3.3-4.2V 5. Speaker impedance: 32 ohms 6. Speaker power: 50mW 7. Battery specification: 300mAh 8. Charging time: 2 hours 9. Talking time: more than 10 hours 10. Music playing time: more than 10 hours 11. Standby time: 300 hours 12. Material: plastic + metal