When unfolded, you can plug it into a vertical or horizontal plug with inside batteries and visible LEDs.
a red LED during charging or flashing in case of fault, and turns green when charging is complete.
Nevertheless, I had some difficulties loading the batteries, as well as those provided new old rechargeable batteries.
Indeed, often the LED turns green when the battery is not fully charged, it is quite amazing and I have seen much more accurate devices and ensure preliminary discharge.
However, there is no overcharging of the battery which also does not heat abnormally.
So practice the move, but not for intensive daily use.
