The new model does away with this connection method. The new AirDots S pairs with your phone in such a way that two handsets connect at the same time, without delays and annoying waits. Of course, you can use either headset, and when you put the other one on, it connects automatically. The 7.2mm mid and low frequency sound unit has mid and low frequencies after repeated tuning by acoustic experts combined with DSP noise cancellation technology that filters out ambient noise and provides crystal clear sound quality. A high-performance polymer lithium-ion battery, means you can use the headphones for around 4 hours when fully charged. With a 600mAh charging case, this can last up to around 20 hours.