Panasonic Operating Instructions for Oral Irrigator

Charging (Fig. 2)

1 Insert main unit so it stands upright in the charging section.
The charging indicator will light up.

• The lamp does not go off even when charging ends.

2 Disconnect the power plug after charging is completed.

(for safety and to reduce energy usage)

So the lamp does not go off even when charging ends! How would I know when to disconnect the power plug?

I bought Panasonic and not a no-name brand no to deal with this kind of c..p. 
Very disappointed, I was expecting more from Panasonic.