EC Technology Bluetooth 4.1 Headset Sports Headphone with Microphone & Stereo with Magnet Attraction-Red&Black Super Bluetooth 4.1 version. Advanced CSR8635 technology makes it More stable, More energy saving. Support Hi-Fi music and HD calling. Suitable for iPhone, iPad, Android and most Bluetooth enable devices. Selectable soft medical grade earbuds, fit different ear size well, fell comfortable even wearing long time. And the buckle makes it possible to get your most favorable length. Magnetic attraction design: hang like a necklace around your neck, and a 10-meter working distance, our sport headphones will let you enjoy music when running, gym, sports or exercise and other activities. Long battery life: Up to 250hours of standby time;4-5 hours for playing and 5hours of talk time with a single charge(2 hours). Package includes:1x Sport bluetooth headset; 4 x Ear bud(pairs); 1 x Ear hook(pair);1x Buckle; 1x USB Charging Cable(30cm); 1x User Manual