1. Bluetooth version: 5.12. Transmission distance: 10 meters3. Frequency response range: 20Hz-20HKz4. Speaker size: 10mm5. Speaker impedance: 32 ohm +/-15%6. Signal-to-noise ratio: greater than or equal to 102db7. Microphone sensitivity: -42dB+/-3dB8. Charging interface: Type-C9. Life time: about 32 hours10. Earphone full charge time: about 1.5 hours11. Replenishment times of the charging box: about 3-4 times12. Voice call, intelligently eliminate noise13. It can be used with both ears and single ear. It can be connected when picked up, which is convenient to use14. Ergonomic design, comfortable to wearSpecification: Package Weight One Package Weight 0.10kgs / 0.23lb One Package Size 16cm * 9cm * 4cm / 6.3inch * 3.54inch * 1.57inch Qty per Carton 100 Carton Weight 11.20kgs / 24.69lb Carton Size 47cm * 42cm * 30cm / 18.5inch * 16.54inch * 11.81inch Loading Container 20GP: 450 cartons * 100 pcs = 45000 pcs 40HQ: 1045 cartons * 100 pcs = 104500 pcs