REMAINING POWER DISPLAY: the true wireless earphones with LED display charging box shows you the remaining electricity real-time, more convenient than those charging cases whose remaining power is hard to recognize via several tiny lights, it's terrible that you can't charge your mini headphones when they power off suddenly during travel, business trip, bus trip and outdoor activities HEALTHIER PLAYING TIME: considering your health, we refuse to design Bluetooth headphone with extremely long playing time, our 4 hours playing time avoids abuse of true wireless headphones and relaxes your ears and brain when you charge earphones with mic in 800mAh charging case, and you can charge earbuds simultaneously while the portable case is charging CLEARER PHONE TALKING: be different from traditional invisible in ear earbuds with single mic, left and right earphone of our true wireless earbuds are both built in microphone, which ensures a fluent and clear phone conversation without blocks, making you totally hands free and you don't need to press your smartphone close to your face ADVANCED BLUETOOTH 5.0: with upgraded version of Bluetooth connection, Bluetooth 5.0 headphones have stabler signal than normal Bluetooth 4.2 earphones, and connection range is up to 33ft; sports earphones with volume control allow you to adjust volume via headphones, no need to find your telephone in your handbag especially when you are on a crowded bus (42)