1. Built-in high-fidelity microphone, support voice calls.. 2. Simple operation, compatible with Android, IOS, win system devices. 3. Built-in smart Bluetooth chip, compared with traditional Bluetooth chip, lower power consumption, faster transmission, smaller delay, strong anti-interference, and more stable signal.. 4. Equipped with 3.5mm headphone jack, it can be used without power, only needs to connect 3.5mm AUX adapter cable. 5. High-performance lithium battery, fast charging, battery life greater than 10H, worry and effort. 6. High-quality leather case, soft elastic close to the ear. Long wear. 7. High sound quality output, original sound enjoyment, HIFI sound quality.. 8. 40mm titanium composite metal sound unit, excellent resolution, strong bass effect.. 9. Folding design, easy to carry.. 10. Start to pair (memory quick connection). 11. Long connection distance (20 meters barrier-free connection). Technical Specification. 1. Bluetooth version: 5.0. 2. Charging time: 1-2 hour. 3. Use time: more than 10 hours. 4. Frequency response: 20HZ--20KHZ. 5. Charging voltage: USB-5v. 6. Speaker impedance: 32 ohms. 7. Speaker diameter: 40mm. 8. Signal to noise ratio: 90DB. 9. Support FM radio. 10. Support TF card, play MP3