GRDE Bluetooth 4.1 Wireless Neckband In-ear Headphones,HD Stereo Sound Sweat-proof Headset/Lightweight Earbuds Earphones with CVC 6.0 Noise Isolating,Support Android IOS Mobile Phones Latest Bluetooth 4.1+EDR Version and CSR Chipset : strengthen the signal 2 times, easy and fast pairing with phones, ipad. Powerful audio driver offers balanced audio and crystal clear sounds . CVC Noise Cancellation 6.0 Technology : With excellent sound effect collection, superior sound isolation, efficiently reduces external noises .High-fidelity stereo music and clear speech , and providing steady Bluetooth signal and support stereo lossless music. Built-in Powerful RechargeableLithium Battery(80mAh) : About 2 hours charging time ,Up to 5 hours talk time ,Up to 4 hours music time ,120~130 hours standby time . Comfortable Flexible Rotatable Earbuds:You can adjust it depend on your ears, ensure you get it perfect fit and remain stable in your ear . Durable and sweat proof, ideal wireless earbuds for the Gym, Hiking, Cycling, Jogging, Climbing , keep secure fit for sports and fitness