Features: 1. Support mp3 play function of tfcard 2. Comfortable wearing of both ears 3. Answer/end / music play / pause 4. Call voice number 5. Support audio cable direct connection 6. Bluetooth connection 7. Folding expansion head beam Specification: Bluetooth Version: Bluetooth 5.2 + EDR Receiving distance: 15m without barriers Music/Talking Time: Up to 24 hrs Charging time: 2-3 hours Standby time: 300 hours Impedance: 30Ω Frequency response: 20Hz- 20KHz Speaker size: 40mm Battery Capacity: 400mAh Pairing step: Connect mobile phones and other Bluetooth devices 1. press the power button to boot automatically enter the pairing state (indicator flashes blue light). 2. Open the Bluetooth device on the mobile phone and click Search Bluetooth Device until it finds the Bluetooth device. Click to connect. There will be a voice prompt when the pairing is successful. Package included: 1x Bluetooth Headphone 1x 3.5mm Audio Cable 1x USB Charging Cable 1x User Manual