Nakamichi NEPTW3, Bullet-shaped Design, Portable. Magnet Design Charging Case with 2100mAh power capacity, able to recharge earphones to 15 times. Charging Case supports other mobile device, convenient and efficient. Smallest Bluetooth Headset. Magnet Design Charging Case. Earphones auto pair to be stereo (L and R). Earphones can be use individually as mono. Built-in microphone for each earphone. Support Multi-point. Nano Coating for sweat-proof.