... reception desk, tour guide booth,,any event, off-line product promotion, trade show, fair, exhibition, election ... Effect: 5 level adjustment by clicking button on the backside- Brightness Control: 4 level- ... Charge: 10~12 Hours in normal text,- Switches: On/Off, Brightness, Message Selection- Accssories: USB cable ... the LED messages can be rotated with a button on the side of the panel. The messages ...