Bluetooth 4.0+APTX Headphones -- GRDE&reg; Sweat-proof Sport Wireless Stereo Universal Neckband Headset With Noise Cancelling Retractable Earbuds , Voice Control Rainproof Music Earphones for Most Smartphones(Silver) Retractable Earbuds : Easy to adjust the length of the line by only pressing a button ; In-ear design and neckband wearing style, comfortable and stable Latest upgraded Bluetooth 4.0+APTX Headphones : Low-power & Low-latency ,provides high-fidelity and stereo music; Highest standards of fidelity audio transmission technology, motion-shaped dual-channel true stereo Perfect Sport Wireless Headphone : Sweat-proof and rainproof ; Light weight ;Super long standby time ---14 hours for music, 12 hours for talking Support power status broadcast, real-time silent ;Built-in high quality microphone ;Support various phone calls (by Wechat,Skype,MSN); Individual ON/OFF button, Answer/Hang Up/Reject the call button, Pause and Play button. Easy to operate; Micro USB Rechargeable Incoming phone vibrate function : your phones will vibrate when someone is calling you. Please press (call button) to answer the phone ;Please Shortly press (call button) to reject the phone