Power-on: long press the POWER key about two seconds until the LED light turns to be green. About eight seconds the green light will twinkle three times then off which means the DVR clock is recording videos Power off: Long press POWER key for three seconds to save the video and power off when the red light twinkles three times. ( P.S: The DVR will automatically turn off when lack of disk space.) Reset Key: Press the reset key to delete the current video files if no need for saving the current video files.( The previous video files will not be deleted) Driver Installation: Need for Windows 98: Install the driver CD to your computer and it will take effect after restart computer. No need for Windows ME/2000/XP OS 9.2.2 or other system above.