1 Driver: 15mm 2.Impedance: 9 ohms 3 Bluetooth version: Bluetooth 5.0 4. output power: 40mW; battery capacity 40MAH, charging case is 350mh. 5. Bluetooth distance: 10 metres 6 Frequency response: 20-20000Hz 7 Operating voltage range: 3.0V-4.2V 8 Powerful noise cancellation circuit (active noise cancellation) 9. charging time of approx. 1-2 hours 10. talk time is about 2-3 hours (pair of headphones use together), music time about 2-3 hours (pair of headphones use together), charging case can charge headphones about 3-5 times.