AirPods are wireless Bluetooth earbuds designed by Apple. They were first released on September 7, 2016, with a second generation released in March 2019. They are Apple's entry-level wireless headphones, sold alongside the AirPods Pro and AirPods Max. Within two years, they became Apple's most popular accessory.In addition to playing audio, the AirPods contain a microphone that filters out background noise as well as built-in accelerometers and optical sensors capable of detecting taps (e.g. double-tap to pause audio) and placement within the ear, which enables automatic pausing of audio when they are taken out.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 which costs extra was added in the offerings.