Product parameters 1. Bluetooth version: Bluetooth 5.02. Bluetooth use frequency band: 2.4GHz 3. Output power: 30mW 4. Bluetooth distance: 15~30 meters barrier-free 5. Frequency response: 20-20000Hz 6. Working voltage range: 3.0V-4.2V 7. Microphone sensitivity: -42dB 8. Powerful noise cancellation circuit (active noise reduction) 9. Charging time is about 1 hour (power indicator charging: red light is on, full charge: red light is off (blue light is on)10. The net weight of the product is about 32g 11. Play time is about 150-180 minutes 12. Standby time is about 70 hours 13. Battery capacity 40 mAH (charging compartment 400 mAH) Complete weight: 120 g Packing size: 10*10*3.5 cm Product color: white Included: headsetcharging compartmentcharging cablemanualbox 
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