Made of environmental friendly PC and ABS plastic, durable, safe and has a smooth hand feeling. Perfect bass reflex sound system bring you unique auditory experience. And it allows you switch songs freely.Wear comfortable, hidden, suitable for a variety of scenes. Built-in high-performance rechargeable Lithium-poly battery, enjoy up to 2-3 hours of music time/ talk time. With 100 hours standby time and 1-2 hours charging time.