Our wireless sport earphones adopt advanced Wireless 4.1 version with multi-point technology, simultaneously connect with 2 mobile devices, high-sensitive inbuilt mic with CVC noise canceling technology, deliver crystal clear stereo sound with transmission range up to 32.8ft without barrier. Inbuilt 110mAh rechargeable battery and equipped with USB charging cable, 8 hrs unstoppable HD sound music while only 2 hrs fully be charged. Its auricle ear hook design and clamp loop snugly fit your ear, secure and stable. Its IPX7 Waterproof performance and easy operation enables it to be optimal for running, jogging, hiking, yoga, exercises, gym, fitness, traveling, etc.. *Crystal Clear Sound: Latest Wireless 4.1version with multi-point technology, simultaneously connect with 2 mobile devices with high quality and high speed signal transmitting, offering impressive crystal clear stereo sound with the 32.8ft maximum distance connectivity. Adopt high-sensitive microphone with CVC noise cancellation technology to reduce ambient noise, grasp the details of voice and offer crystal clear sound even in a noisy environment. *User Friendly and Multi-use: Featured with MFB (Multiple function button) Button and /- (Volume/Track adjustment) Button, simply and quickly fulfill almost all functions like answer/end a phone, play/pause, pairing, power on/off, etc. Easy operation and brings you much convenience. *8 Hrs Unstoppable Music and 2 Hrs Fully Charged: Inbuilt with 110mAh rechargeable battery and equipped with USB charging cable, 8 hrs unstoppable HD sound music while only 2 hrs fully be charged. *IPX7 Waterproof and Widely Use: IPX7 Water-resistant Nano-coating efficiently protects sport earphones from sweat and ensures more guaranteed life span. Enjoy music freely in outdoor thanks to its IPX7 Waterproof design. Optimal for running, jogging, hiking, yoga, exercises, gym, fitness, traveling, etc.. *Snugly Fit and Stable Wearing: Adopt soft ear tips, 20.87inches clamp loop and auricle-shaped hook, adapt to ear canal to provide a perfect seal and snug fit to wear your earphones in place. Closely fit and never worry about falling out of your earphone even when you are running. Brand: iMounTEK Product Type: Wireless Sport Earphones Wireless Version: Wireless 4.1 EDR Chip: CSR8635 Transmission Range: 10m/32.8ft (Without Barriers) Transmission Frequency: 20-20000Hz SNR (Signal to Noise Ratio): -42±3dB Impedance: 32±15%Ω Music Play /Talk Time: 8Hrs Charging Time: 2Hrs Charging Input: 5V/100mA-1000mA Earphone Battery Capacity: 110mAh (Left ear inbuilt with 1 battery) Standby Time: 250hrs Waterproof Level: IPX7 Waterproof and Sweat-proof Performance Material: ABS PC Materials Micro USB Length: 26cm/10.24inches Neck Cable Length: 53cm/20.87inches Earbud Diameter: 1cm/0.39inches Per Earbud Size (With Earhook): 4.3x5x3cm/1.70x1.97x1.19inches Item Weight (With Earhook): 20g/0.045lbs Package size: 15*15*5cm/5.9*5.9*2in Package weight: 57g/0.13lbs