But not enough for a Asus Transformer that requires 15V. That said, it is not sold for that.
The pilot actually remains on at all times. But hey, with all USB devices of today, this charger is rarely empty.
According to the leaflet, the pilot is supposed to flash when the current is not sufficient for all connected devices (eg given in the instructions. The charger will not power 7 Ipad same time !!!)