FAVOLCANO S-501 Wireless Bluetooth V4.1 Stereo Sports Sweatproof Earbuds for Android Phone/Iphone/Bluetooth Device (Black) Advanced version S-501 with latest Buletooth 4.1 technology, contributes Buletooth headset in powerful audio and amazing stereo music. Strong Wireless Signal: you can enjoy skip-free music in a 10-meter working distance It will Connect to two bluetooth devices at the same time simultaneously and switch quickly between your calls and music. According to the human body engineering design, Exercise-proof Comfortable when exercising, running, climbing, driving, skating, camping, fishing and other outdoor sports. Small,medium and big size earhooks included, better operating experience. Easy using with pushing the power button on one side, amazing compatible with iOS iPhone iPad Samsung Galaxy series S6 S5 LG G4 G3 and other Smartphone. Up to 4 hours of continuous talking / music time and up to 120 hours of standby, FAVOLCANO Headset provide 12-month worry-free warranty.