I made this 2nd purchase for my wife as I was very impressed by the quality of Taotronics Bluetooth Earbuds I bought recently.
Compared to my other model version (79), this model (53) is much improved in ergonomics while retaining other advantages such as connectivity. Due to the designed shape, the buds stay in my ears much more stably and more comfortably. For connectivity, this model performs outstandingly well as all connections are done before they reach your ear. They well in both single- or twin-mode. The two buds get paired automatically once the shield box is opened within range. For battery life, this model can last at least 30-40 hours by my personal test.