Most Stable Bluetooth 5.0 TechnologyCompared to the traditional Bluetooth 4.2, Arbily Bluetooth earphones have higher transmission speed, longer transmission distance (15M without obstacles) and greater data transfer volume. It is so powerful and stable that the audio signal can be transmitted with high quality, low latency and continuous stability.HD Stereo AudioStereo Sound: Arbily Bluetooth earphones have a built-in 10mm Hi-Fi drive with high-resolution stereo sound, gentle bass and clear highs.Mono Sound: Arbily's left and right earbuds can be used separately. Connect them to 2 mobile phones that can be used by different people.Power Bank for Mobile DevicesThe 3000mAh Charging Box can be used as a portable power bank that can charge all mobile devices including your phone and headphones. Buy an Arbily I19, get a pair of Bluetooth headphones and a portable power bank.IPX7 Sweat-proof EarphonesThe waterproof coating efficiently protects sports earphones from sweat and rain. You can enjoy music in the rain. The ergonomically shaped sports headphones are ideal for running, cycling, hiking, yoga, gym, fitness, travel etc.Touch ControlCool multi-functional one-button operation, just touch the headphones to play/pause music, change song, volume +, answer / end calls.Easy to CarryThis pocket-friendly charging case protects and charges your earphones while you recover from your workout.Extremely 0.15oz light weight and mini IN ear design ensure that the earbuds stay comfortably in the ear and never fall out.