I once had a Jabra HALO2 of very good quality already. With Jay Bird JF4, dimensions and weight is gained on the ear, and also its quality. In addition, it is possible to take his calls when paired with an iPhone (my case). Automie 4 1/2 hours approximately. It comes with a very practical and attractive storage case. It also comes with several adapters intra ears but above the ear. My purpose: Running and biking.