The Earfun Air Pro 4 use an in-ear fit and are fully true wireless, meaning there are no cables or neckband involved. Each earbud weighs just 10 grams and carries an IPX5 water resistance rating, making them tolerant of sweat and splashes in everyday conditions. Stereo speakers are present on both sides, while wingtips, RGB lighting, a UV light, and a display are all absent from the design.
The Earfun Air Pro 4 feature both active noise cancellation (ANC) and passive noise reduction, giving users two layers of sound isolation. Audio is handled by a 10 mm driver unit with a frequency range spanning 20 Hz to 20,000 Hz, an impedance of 32 Ohms, and a sound pressure level of 106.3 dB/mW. The earbuds do not support spatial audio, Dolby Atmos, Dirac Virtuo, or a neodymium magnet driver configuration.
The Earfun Air Pro 4 offer 11 hours of battery life per charge, dropping to 7.5 hours when ANC is active, while the 600 mAh charging case extends total playback to 20.5 hours. Each earbud houses a 54 mAh rechargeable battery, and a full charge takes approximately one hour. Wireless charging is supported, and a battery level indicator keeps users informed of remaining power. The earbuds do not include a solar power battery.
The Earfun Air Pro 4 connect wirelessly via Bluetooth 5.4 with a maximum range of 15 meters and an audio latency of 50 ms. Codec support is broad, covering LDAC, aptX Adaptive, aptX Lossless, Bluetooth LE Audio with Auracast, and AAC, while LDHC, aptX, aptX HD, aptX Low Latency, and aptX Voice are not supported. Fast pairing is available, and the case charges over USB Type-C, though NFC pairing is absent.
The Earfun Air Pro 4 include a practical set of features, among them ambient sound mode, in-ear detection for automatic music pausing, a find device function, and a mute option for calls. Multipoint connectivity supports simultaneous pairing with up to two devices, and the earbuds can function as a headset with a device-based control panel. Fast charging is supported, and voice prompts are present for audio feedback. A travel bag is included in the box, and the product carries an 18-month warranty. Notification readout, a body temperature sensor, and a built-in camera remote are not part of the feature set.
The Earfun Air Pro 4 are equipped with six microphones in total, all backed by noise-canceling technology to help reduce unwanted background sound during calls. The microphone array covers a frequency range of 20 Hz to 10,000 Hz and operates at a sensitivity of -38dBV/Pa.