As seen in Future Tech There’s tons of tiny tech in these things. Accelerometers activate the microphones if they sense that you’re talking.
BLUETOOTH 4.1 & BUILT-IN MIC: The upgraded Bluetooth chip provides quicker and more stable connection with your devices within 33 feet long and larger compatibility. The built-in mic achieves hands-free talking.
LONG LASTING TIME: The stronger battery provides up to 6-hour music or talk time and up to 180-hourstand-by time with a single charge of 2 hours. Long navigating time and convenient charging reduce your worry about power-off.
LIGHT & INVISIBLE: The total weight of this earbud is only 0.16 ounce, so you will almost feeling nothing, never giving you any burden. Mini and tiny design, smaller than the size of your fingers, makes it nearly invisible. Mini but strong.
LARGER COMPATIBILITY & MULTIPOINT CONNECTION: It can pair with all the Android and Apple smartphones as well as devices with Bluetooth function. Besides, it can connect with 2 Bluetooth devices at the same time.