simple (1) press & hold button till green light comes on. While green light is on solid you can take pictures by pressing the button again for 2 sec( green light will go out for a couple seconds & goes back to green (this means you have finished taking the picture & ready to go again) For Video & Sound recording. Press the button for longer time (4to5 seconds) & Green light will flash & then go out (green light goes out until you press & hold button again to stop. To turn off (Hold button down until it flashes red). The 8meg will slowly flash green when video or sound recording. The 4meg will just go dark as long as recording. I have both & am a 30YR. ENG TECH & HAVE TESTED BOTH FOR 6 to 10 hour. This what I found to work & work well. GOOD DAY!!!!!