... capacity 32GB TF card.4.Sound design: Use best horn, ensure HI-FI acoustic. Use best decode chip, ... talk by internet6.LED indicator: Green light flash, it works normal. Red light flash, needs to recharge, after flash ... 1 min,headset shut off auto. Charging, red light keeps flashing, light stop, the battery is full of power. ... it shut off auto after 30s Good quality Wireless headphone with various color