Opta sports Gear is good Smartwatch. I am not this product user but I hear this watch Details . You can not wifi connection in this watch. Its sensor is good. Its Bluetooth( 3.0V) connection is good. Its battery power is too good by li-lon battery. Its display size is 0.49 inches is good. Its use by men, women, Boy, Girls. But Opta sports Gear is so costly. You can not get in call function. So it is not so good watch.