As far as hardware specifications are concerned, each earbud in the Echo Buds packs three microphones (for Alexa) and two balanced armature drivers for sound. There are built-in sensors that automatically pause playback when you take the Echo Buds off. There are also tap gestures such as double-tap to activate Bose noise reduction, tap and hold to access the default voice assistant (such as Google Assistant or Siri) on your phone, and more. The Echo Buds are IPX4-certified against splashes, sweat, or light rain. An amazing feature of the new headphone is that it includes up to five hours of battery of a single charge, with up to 20 hours total including the battery case. However, ironically, the Echo Buds can be charged only via micro-USB and not USB Type-C. The Echo Buds will cost $129.99 and will be available for purchase in the U.S. from October 30. Pre-orders for the headphones have already begun this Wednesday.