Audio technology: • Custom high-excursion apple driver • Custom high dynamic range amplifier • Personalised spatial audio with dynamic head tracking • Voice isolation • Adaptive eq • Vent system for pressure equalisation --- Sensors: • Dual beamforming microphones • Inward-facing microphone • Optical in-ear sensor • Motion-detecting accelerometer • Speech-detecting accelerometer • Force sensor --- Chip: • Apple h2 headphone chip --- Dust, sweat and water resistance: • Dust, sweat and water resistant (ip54) --- Charging case: • Works with usb‑c connector --- Battery: Airpods 4 • Up to 5 hours of listening time on a single charge • Up to 4.5 hours of talk time on a single charge Airpods 4 with charging case (usb‑c) • Up to 30 hours of listening time • Up to 20 hours of talk time • 5 minutes in the case provides around 1 hour of listening time or around 45 minutes of talk time --- Connectivity: • Bluetooth 5.3 wireless technology --- In the box: • Airpods 4 • Charging case (usb‑c) • Documentation • Usb-c charge cable sold separately