AirPods are wireless Bluetooth earbuds created by Apple. They were first released on December 13, 2016 and are sold alongside the premium AirPods Pro. In addition to playing audio, AirPods feature a built-in microphone that filters out background noise, which allows taking phone calls and talking to Apple's digital assistant, Siri. Additionally, built-in accelerometers and optical sensors can detect taps (e.g. double-tap to pause audio) and in-ear placement, which enables automatic pausing when they are taken out of the ears. On March 20, 2019, Apple released the second generation AirPods, which feature the H1 chip, longer talk time, and hands-free "Hey Siri" support. An optional wireless charging case was added in the offerings.