This Bluetooth watch can be connected to iPhone and android smart phones to provide a range of functions such as email, call and text notification with the bonus of never requiring charging or battery replacement. Eco-Drive technology generates power via light sources, with 4 years worth of power maintained in reserve. In addition to on-board technology, precision is assured with advanced chronograph, accurate to within 1/1 of a second. Constructed from stainless steel with a sleek black ion finish, it offers intense accuracy and a stylish look, all complemented by sophisticated technology to keep you on the cutting-edge.