With active noise cancellation, adaptive sound and noise cancellation mode. Release year 2024. Adaptive equalizer. Wireless charging case USB-C. Dust, sweat and water resistant. IP54 rating Dimensions and weight: AirPods 4 individually: height 30.2 mm, width 18.3 mm, depth 18.1 mm and weight 4.3 g. Charging case (USB-C) height 46.2 mm, width 50.1 mm, depth 21.2 mm and weight 34.7 g. Bluetooth 5.3 Dual directional microphones Inward-facing microphone. Optical in-ear sensor. Motion-sensing accelerometer. Speech-sensing accelerometer. Pressure sensor.