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Function Description: Open PowerPoint files Press "Page Up" button for 2 seconds to start the presentation, Press it again to Stop the presentation. Simply press"Page Up" or "Page down" to go forward/backward the preesentation. Press"Tab"button if there is a hyperlinks in the presentation and press"Enter" to open it. Once the hyperlinks was open, long press the "Tab" button to switch the opened application window and release "Tab" button to choose the application window. Default setting for "Page Up" or "Page down" is arrow up/down function on computer, press "Page Up"and "Page Down" at the same time for the first time, it will change to arrow left/right function on computer. Press it at the same time for the second time, it will change to page up/down on computer and once press it at the same time for the third time, it will go back to default setting. You may press "Volume Up" or "Volume Down" to adjust system volume. Charging the wireless presenter: 1. Once the battery is low, the red LED light will flash slowly to remind you of charging the devide. 2. Connect the wireless presenter to USB port, the red LED sill stoped flash and show steady red, it goes into charging status. 3. When the red light turns off, it means the battery is full.(Usuakkt it will take about 2 hours to full charge the device. package contents: Wireless presenter*1 User Manual*1 Charging cable*1 Notice: Due to 2.4G wave technolog adoption, the connection can be subject to interference from obstacles, like walls, metals or other electronic devices. Please keep the space between the keyboard and USB receiver free of obstacle.