Product Name: Smart Color Screen Multi-functional Headphones Product color Black/White Product chip Jerry 7003D8 noise reduction Working frequency 2.402 to 2.480 GHz Charging time 1H Charging input DC 4.75 - 5.25 V / 600 mah Charging case battery 3.7V polymer battery, 500mAH Product model A9 PRO Weight of a single item 68.5 g Bluetooth version 5.4 [Binaural Communication] Transmission distance 15 meters [Accessible] Microphone 2718 silicon microphone -42±3dB Speaker unit F13 titanium composite film, 32Q±15% 118 ± 3dB, 1mW Headphone battery 30mAH The product includes Headphones, large, medium and small ear caps, data cable, instruction manual, lanyard, packaging box