Asus S1 - Manual (Page 22)

 LED projector E-Manual
1. Connect the LED projector to the power adapter.
A. Connect the power cord to the power adapter.
B. Connect the AC power cord to a power source.
C. Connect the DC power connector to your LED projector.
Operating your LED projector
This portable LED projector allows you to plug and play your devices
so you can easily open multimedia files and hear audio straight from
its built-in SonicMaster speakers.
For your safety and to maintain the quality of this unit, refer to the
following steps when operating your LED projector.
NOTE: The power adapter may vary in appearance, depending on
models and your region.
Charge the LED projector for 3 hours before using it in
battery mode for the first time.