Specifications:This headset has a built-in 300mAh large-capacity battery, which can achieve higher density, higher safety and longer charging time.Built-in bluetooth-compatible 4.1 and EDR chip, it is not only has strong performance, but also has a low power consumption design and stronger signal.High-definition CVC noise reduction processing technology can effectively filter out noise and make human voice clearer.It is life waterproof, which is very suitable for exercising in the gym and sweating.Item Name: HeadphoneBluetooth: 4.1Battery Capacity: 300mah(Included)Sensitivity: 123 DecibelsFrequency Response Range: 20-2000HzResistance Level: 9Music Time: about 6-8 HoursCharging Time: 1 x 2 HoursMaterial: ABSFeatures: Large-Capacity Battery, Built-in EDR Chip, High Performance, CVC Noise Reduction, WaterproofSize: 7cm x 3cm x 2cm/2.76" x 1.18" x 0.79" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Headphone1 x Charging Cable2 x Ear Hooks2 x Ear Caps1 x User Manual