If the Hub is connected, so lights up a red little light. there is only one light for all 4 ports. Whether the hub protects against overvoltage, I do not know. since the stroke is very small, is certainly well suited for smartphones. Laptops or larger load volumes because I would not necessarily hang up. It is not suitable for continuous charging use, but only just recharge times. The stroke itself is white, the black cable.
Ideal for traveling.
