It does not work as a triggered camera, time lapse only. The amount of pictures depends on picture size and number/frequncy of pics taken. It will take up to a 16GB (CLASS 2) card, so multiple the number below by size of card and how many pics you want per day (ie, two hours at dawn and then two at dusk and a pic every minute is 4hours x 60 pics=240 per day)Resolution Picture count stored with 2GB SD CardLOW 640 x 480 ---10,994MEDIUM 1280 x 720 ---3,206HIGH 1920 x 1080 ---1,749FINE 3264 x 2448 ---961VIDEO 640 x 480 ---274***Estimates. Actual capacity will vary based on image properties