PREMIUM HD AUDIO PERFORMANCE: Featuring latest Bluetooth 4.1 CSR technology + CVC6.0 passive NOISE CANCELLING technology to reduce the background noise?? ensure clear voice and more stable transmission signal.</br>LONGEST BATTERY LIFE: The new and improved lithium polymer battery allows seamless enjoyment of music for up to 7 hours and 2 hour of talking at the cost of a quick charge of only 2 hours.</br>COMFORTABLE and SECURE FIT: Built for your active lifestyle?? the earbuds are rated IPX Level 4 and can withstand dripping sweat; Best workout sweatproof bluetooth headphones. Great for Running?? Jogging?? Hiking?? Biking?? Gym etc. Stay in Ear Tech with Comfortable Ear Hook.</br>BIONIC DESIGN: All buttons wireless earphones is easy to operate. Premium soft silicone gel surface provides comfortable wearing in the ear canal and a good feeling in hand with anti-Fingerprint effect.</br>MOBILE DEVICE COMPATIBILITY - it easily connects with all Bluetooth enabled devices. Everything you need to manage your personal listening experience (volume?? pause?? forward/back?? answer phone calls) with a touch of a