Our sport headset adopt advanced Wireless V4.2 with multi-point technology, simultaneously connect with 2 mobile devices, high-sensitive inbuilt mic with noise canceling technology, deliver crystal clear stereo sound with transmission range up to 32.8ft without barrier. Inbuilt 220mAh rechargeable battery and equipped with USB charging cable, 9Hrs unstoppable HD sound music or 15Hrs continuous call while only 3Hrs fully be charged. Multi-functions can be achieved via pressing MFB (Multiple Function Button) button and /- (Volume/Track adjustment) Buttons. Skin-friendly ear tips, adjustable left/right headset wires and magnetic collar of headset provide an optimal seal and snug fit to wear your headset in place. Optimal for running, jogging, hiking, yoga, exercise, gym, fitness, traveling, etc. due to sweat-proof performance. *Crystal Clear Stereo Sound: Latest Wireless 4.2 version 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 noise cancellation technology to reduce ambient noise, grasp the details of voice and offer crystal clear sound even in a noisy environment. *15Hrs Work Time and 3Hrs Fully Charged: Inbuilt with 220mAh rechargeable battery and equipped with USB charging cable, 9Hrs unstoppable music time or 15Hrs talking time while only 3Hrs fully be charged. *User Friendly and Multi-use: Featured with MFB (Multiple function button) Button and /- (Volume/Track adjustment) Buttons, simply and quickly fulfill almost all functions like answer/end/redial a phone call, play/pause, pairing, power on/off, etc. Easy operation and brings you much convenience. *Snugly Fit and Stable Wearing: Adopt skin-friendly ear tips, 16.34inches neckband,12.21inches adjustable left/right earphone wires(via wire controllers), adapt to ear canal with adjustable length to provide a perfect seal and snug fit to wear your headset in place. Magnetic collars of headset to clamp together and surround your neck properly and never worry about falling out of your earphone even when you are running. *Sweat-proof and Widely Used: Adopt Water-resistant Silicone Gel materials with special treatment can efficiently protects sport earphones from sweat and ensures more guaranteed life span. Optimal for running, jogging, hiking, yoga, exercises, gym, fitness, traveling, etc.. Brand: KOCASO Wireless Version: CSR8635 V4.2 Impedance: ≤2.2KΩ Working Temperature: -20℃- 35℃ Microphone Sensitivity: -42±3dB SNR(Signal to Noise Ratio): ＞58dB Transmitting Power: Class 2 Protocols Supported: HSP, HFP, A2DP, AVRCP Driver Unit: Ф13mm Talk Time: 15Hrs Play Time: 9Hrs Standby Time: 200 Hrs Charge Time: 3 Hrs Standby Current Rate: 0.9mA Operation Range: 10m/32.8ft Battery: Built-in 220mAh Lithium Battery Per Earphone Wire Length: 31cm/12.21inches Neckband Length: 41.5cm/16.34inches Microphone USB Cable Length: 21cm/8.27inches Available Colors: Black, Red Materials: TPU and Silicone Gel Item Size: 20×14×1.1cm/7.87x5.51x0.43inches (L×W×H) Item Weight: 30.5g/0.067lbs Package Size: 17×21.5×3.2cm/6.69×8.46×1.26inches (L×W×H) Package Weight: 138.5g/0.31lbs