Mfish 4-in-1 USB Charging Cable

Mfish 4-in-1 USB Charging Cable

Whats the overcharge rating or safety rating of this thing. Curious if it is going to overload and burnout or even overheat to a point of burning out and stop doing what its supposed to do. In a worst case scenario, will it (god forbid) blow out the phone charging port or charging block it may be connected to?

This item is sold out.