Vtin Dew Sweatproof Bluetooth Wireless Sport Headphones Earbuds w/ Noise Cancelling & APTX Tech, Hands-free Calling, Mic for Sports/Running/Gym/Exercise, Compatible with iPhone and Android TRUE WIRELESS STEREO(TWS):Alfheim EASY PAIR True Wireless Earbuds, set yourself free from all cables, Bluetooth Bluetooth 4.1+Aptx,CVC 6.0 HD ensure high-fidelity stereo sound quality and clearly call quality EASY PAIR TRUE WIRELESS HEADSET:Alfheim Easy-Pair Technology provide 1 click pair, The two earbuds will be paired automatically after you turn on them. SMART STEREO& MONO MODE - Alfheim EASY PAIR Headsets be used dual or separately as you wish, which means you can share the same music/videos with friends and enjoy the clear stereo sound by using both headset. But only the master headset has sound when at the calling mode, the safety feature allows you to hear the traffic while driving. UNIVERSAL COMPATIBLE : Compatible with iPhone, iPad, Samsung, Android Phones,Smart Phones Tablet and other Bluetooth enabled devices. Range up to 33ft, enjoy the freedom to move and the convenience of uncompromising sound quality. LONG WORKING TIME: provide nearly 6 hours Talking Time, 100 hours Standby Time.