One-step Pairing- A40 Pro wireless earbuds Built in hall switch, headphones wireless bluetooth will auto power on and connect with your last device once you open the charging case after first connection, which is faster and more convenient.Crystal and Clear Calls and Immersive Stereo- A40 Pro Bluetooth earbuds have strong 12mm speakers driving units and in ear acoustic structure support, which produces a strong bass, clear mid sound, and bright treble. The unique acoustic design of the cavity room, balanced internal and external air pressure, avoid sound loss, ensure stable sound and penetrating power, even in a noisy environment can provide clear voice detection. You can enjoy your personal space whether you are indoors, outdoor, work or exercise.Stable & Low Delay Bluetooth 5.3 Wireless Earbuds- Compare to 5.0 headphones wireless Bluetooth, The Bluetooth 5.1 chip helps your earbuds be matched more easily and faster. Ear buds wireless Bluetooth earbuds signal is much stronger and more stable.There is almost no delay in the gaming/watching videos. Pictures and Bluetooth headset sound are synchronized. Take you much better using experience.Fit Design & Smart Touch Control- The half in-ear design with an angle of 108 degrees, which makes the earbuds comfortable and stable to wear. The touch-sensitive control allows easy navigation through settings and the ergonomic, streamlined design provides comfort, so you can listen to music undisturbed during exercise, working, running, walking, traveling.IPX7 Waterproof & Compatible- The wireless earbuds are IPX7 waterproof, perfect to enjoy your playlist without worrying about sweat, water, or moisture. The earphones can be used for both Android and IOS cellphones.Beautifully Compact Charging Case and 50Hrs Playtime- The compact charging case is easy to take with you when you are out and about, and it provides long battery life.