With the magnetic charger, you could charge the earpiece by drop and go with one hand only, extremely convenient for driving. No more worry about the cable plug direction or wire dangling. The 50mAh battery built-in could deliver 6h music playtime and 4h talking time, but only 1.5-2hours needed to get full charged. Enjoy the whole day music without missing a call. As tiny as the first section of a pinky, this mini earbud could still pump out a powerful sound with clear treble, mediant and bass. Invisible wearing without compromising of music enjoyment. The ergonomic design with 3 pairs of ear tips help to keep the mono earbud in the place for long time wearing without dropping. No burden or hurt to the ear canal with the light weight of 5g/0.18oz. IPX5 sweatproof earphone with mic for iPhone and Android phones.