BenQ S660C - Manual (Page 17)

Preparing Your Phone For Use 3
2. Insert the charger connector into the charger socket on the
bottom of the phone. Make sure that the connector is inserted
in the correct orientation (with the arrow pointing up).
3. Insert the charger into a power outlet.
4. Once the phone is fully charged, remove the charger from both
the power outlet and the phone.
Charger connector
Charger socket