Features: -USB Rechargeable, no need to replace the battery, environmental-friendly, with a long standby time. -Built-in intelligent chip, clear and noise-canceling, no worry about the noisy environment. -Strong shell, anti falling and durable, it still can be used normally even if it fell from two meters high. -360° adjustable, suitable for left or right ear to wear. -Ergonomic design, soft and flexible, can help you a lot in daily life. .