Audio Technology1 Custom high-excursion Apple driver Custom high dynamic range amplifier Voice Isolation2 Personalized Spatial Audio with dynamic head tracking3 Adaptive EQ Vent system for pressure equalization Custom high-excursion Apple driver Custom high dynamic range amplifier Active Noise Cancellation Adaptive Audio4 Transparency mode Conversation Awareness4 Voice Isolation2 Personalized Spatial Audio with dynamic head tracking3 Adaptive EQ Vent system for pressure equalization Sensors Dual beamforming microphones Inward-facing microphone Optical in-ear sensor Motion-detecting accelerometer Speech-detecting accelerometer Force sensor Chip H2 headphone chip Controls Press once to play or pause media Press once to answer a call or mute or unmute Press twice to end a call Press twice to skip forward Press three times to skip back Dust, Sweat, and Water Resistant5 Dust, sweat, and water resistant (IP54) Size and Weight (Each)6Illustration of AirPods 4 showing width of 0.72 inch in width and 1.19 inches in height0.72 inch (18.3 mm)1.19 inches (30.2 mm) Height: 1.19 inches (30.2 mm) Width: 0.72 inch (18.3 mm) Depth: 0.71 inch (18.1 mm) Weight: 0.15 ounce (4.3 grams)