Feature 1 The for Qualcomm chip and dual antenna design doubles the transmission range and makes the connection more stable. 2 You can enjoy a seamless listening experience even under electromagnetic interference such as gyms, train stations and airports. 3 With optimized antiinadvertent protection, you can precisely adjust the volume, skip tracks, play or pause music. 4 The bass tuning has strong power, extreme depth and rich layers, while ensuring clear vocals and crisp treble. 5 The bluetooth earphones use the material of ABS, so it is stable and has a long service life.Item Type: Bluetooth HeadsetMaterial: ABSChip: ChinaCacheSupport: A2DP DecodingReceiving Distance: Approx. 10m/32.8ftHeadphone Built-In Battery: Lithium Polymer Battery The Built-In Battery Capacity: 50mAhThe Built-In Battery of The Charging Box: Lithium Polymer Battery The Built-In Battery Capacity: 500mAhSpecification of The Built-In Battery In The Charging Box: 902030Working Voltage: 3.7V (3.3~4.2V)Charging Time: <=2 HoursStandby Connection Time: >=100 Hours Music Playing Time: >=3 HoursMicrophone Sensitivity: -42+-3dBWorking Current: <=13mA Package List2 x Headphone1 x Charging Box1 x Charging Cable4 x Ear Cap