Abstract: A charging apparatus for laptop computer with multiple-batteries is used in a first battery unit and a second battery unit. The charging apparatus comprises a micro controller unit; a first charging switch unit electrically connected to the micro controller unit; a second charging switch unit electrically connected to the micro controller unit; and a charging unit electrically connected to the first charging switch unit and the second charging switch unit. The micro controller unit controls the charging unit charging the first battery unit and the second battery unit via controlling the first charging switch unit and the second charging switch unit. The charging apparatus charges multi-batteries simultaneously.

Abstract: A handwriting board with a liquid crystal display (LCD) includes a wireless Universal Serial Bus (USB) unit, a USB hub unit, a USB/Video Graphic Array (VGA) conversion unit, a LCD driver unit, a LCD unit, a touch pad controller unit and a touch pad unit. When a user writes on the touch pad unit, the content written by the user is transmitted from the touch pad controller unit and the USB hub unit 204 to the wireless USB unit, which transmits the written content to a computer for processing. The processed written content is then transmitted to a projector and the wireless USB unit. Thereby, the written content can be displayed on the LCD unit.

Abstract: A monitor clamping device includes a first board having multiple first hooks and a second board having multiple second hooks, the monitor is clamped between the first and second hooks. Multiple first slots are defined in the second board and multiple first guide plates are connected to the first board. The first guide plates movably extend through the first slots. Multiple second guide plates are connected to the second board and engaged with the first guide plates when the first guide plates are moved to a lower end of the first slots. A resilient unit is connected between the first and second board so as to adjust the distance between the first and second hooks. The monitor clamping device can clamp different size monitors.