The connection distance is up to 35 feet, so there is no need to worry about interruption in listening and control.You can automatically pair this device with the bluetooth-compatible device seamlessly without any problems when you open the headset box and you don& 39;t need any skills to use wireless headphones.Using active noise reduction technology with complex acoustic structure, real-time calculation of noise reduction chip, generating opposite sound waves to cancel the noise, providing you with perfect sound.The charging compartment can be used for about 50 hours of talking and 40 hours for listening to music. The total number of times the headset can be fully charged is about 10 times.The inner coating of earplugs and charging box makes it waterproof which is suitable for gymnastics and sweating, and it can even clean earplugs and base.With LED digital display design, you can clearly see the power of each earphone and charging box, without worrying about power failure.Moreover, the box is small and can be placed in a pocket/bag/wallet, so it is ideal for running, jogging, cycling, and exercising in the gym.Item Name: bluetooth-compatible HeadsetModel: ANC ProMaterial: ABS, PCBluetooth Version: 5.1Support bluetooth-compatible Protocol: AVRCP V1.6.A2DP V1.3.HFP V1.7 Simultaneous LE and BR / EDRNoise Reduction Version: ANCFrequency Range: 50Hz~20KHzConnection Distance: 10-15mSensitivity: -85dBmAudio Signal-to-Noise Ratio S/N: ≥90dBHeadphone Battery Capacity: 50mAh(Included)Charging Compartment Battery Capacity: 400mAh(Included)Standby Time: 80 HoursHeadphone Playback Time: about 4 HoursCumulative Playing Time: about 40 Hours (with Charging Box)Headphone Charging time: about 1 HourCharging Time of Charging Compartment: 3-5 HoursFeatures: Automatic Pairing Technology, Active Noise Reduction, Large-Capacity Battery, Waterproof, LED Digital DisplaySize: 7cm x 3.7cm x 3.3cm/2.76" x 1.46" x 1.3" (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 Pair of Wireless Headphones1 x Charging Compartment1 x Charging Cable2 Pairs of Pair Earmuffs1 x User Manual