"Version advanced Bluetooth 4,1. This used technology allows for better stability and energy saving. Support HD calls as well as Hi-fi music. Compatible iPhone, iPad, Android and most Bluetooth devices. Several medical quality tips are available, choose the right size for long lasting, maximal comfort. The strap allows you to adjust the length of the cable. Magnetization design: wear around your neck like a necklace, the distance of functioning is 10 meters, these earphones will allow you to take advantage of your music during your exercises, your races, your sport and other activities.These earphones are also Waterproof. Advanced autonomy of the battery: up to 250 hours in sleep mode; 4-5 hours in listening and 5 hours in communication with a single 2 hour re-charge. Contains: 1 x Bluetooth sports earphones; 4 x tips(pair) ; 1 x port of fixation (pair); 1 x girth; 1 x USB cable of refill (30cm; 1 x instructions for use)"