It made of ABS+PC material.When put them on, the stereo dynamic speakers deliver crisp sound, giving you a superior audio experience. LED digital power display, the remaining power of the charging compartment is clear at a glance, avoiding the embarrassment of sudden loss of power! The power of the left earphone, the total power of the charging compartment, and the total power of the right earphone are clearly visible. Applicable products: smart matching phones, tablets (compatible with Android/iOS and other systems) Put the earphone into the charging compartment and cover it, the earphone will be charged automatically, the earphone will light up in red when charging, and it will go out when it is full..syi