Vastar Bluetooth 4.0 Wireless Stereo Sport Headphones Earbuds with Mic Hands-free Calling Bluetooth 4.0 with aptX codec, you can begin enjoying High-fidelity stereo music and clear speech instantly. Long time playing. Up to 6.5 hours of Talk/Playing Time and 205 hours Standby Time. Comfortable and stable design for all levels of exercise make easy accessible on-ear controls when you keep moving and eliminates troublesome wires tangling while you control your music or calls Signal Enhance Technology: Using Vastar on your body without traditional limitations. Even put them in bag at the gym and workout at a good distance without signal droppage. Sweat-proof, durable design, Onscreen Battery Meter.