Bluetooth HeadphonesGRDE Sweatproof Bluetooth 4.0 Headsets,Wireless Stereo Earphones with Microphone In-ear Noise Cancelling Headphones Earbuds for Sports/Running/Exercise Sweat-proof & Durable Design : Barrier-free Bluetooth 10-meter working distance, Let you enjoy music when running, gym, sports & exercise and other activities. Noise Cancellation Technology : High-fidelity stereo music and clear speech , and providing steady Bluetooth signal and support stereo lossless music. Bluetooth 4.0 : Easy and fast pairing with smartphones, tablets and other Bluetooth enabled music devices , just enjoy music anytime. Long- Lasting Enjoying of Music : About 4 hours talking/playing time, 2 hours charging time, 250 hours standby ; With LED indicator light. Comfortable & Easy to operate : Control volume, select songs and receive phone calls via the buttons on the interfaces . Built-in memory wire to adjust shape for different ears.