[Ultra Lightweight and Compatible for Small Ear] The surface and Angle of A1 earbuds in-ear part have been polished and refined repeatedly to achieve a balance between beauty and comfort and make it comfortable to wear. Likewise, a single earbud weighs only 3.7g, making it as light as a feather and discreet in the ear. Ergonomic design provides a comfortable and secure fit that doesn’t protrude from your ears especially for sports, workout, gym. | [Stereo Sound Quality] TOZO A1 earbuds’6mm diameter speaker presents a powerful and wide sound range, which makes the treble full of dynamics, and the bass powerful.Adopt advanced Bluetooth chip makes the sound played by the earphones much more beautiful and pleasant, suitable for sports or home work. | [32 Preset Modes with TOZO App] Connecting to the TOZO app offers access to extra features, which tailoring the sound output to suit your personal preferences. Whether you prefer stronger bass or more balanced sound, these earbuds give you the flexibility to follow your fine-tuned audio. | [Bluetooth 5.3&Long Distance Connection] With Bluetooth 5.3 technology A1 has superior sound quality and strong signal, so that there is no disconnection in listening music or making phone calls within 12 meters. | [Long Battery Life] With headphone 40mAh capacity and charging bin 400mAh capacity. The earbuds lasts 7 hours for normal use, and the charging bin after fully charged via USB A to USB C charging cable, which can enjoy extending 32 hours of playtime, equivalent to listening to 480 songs without missing a beat.