Power on/off: when pressing power key", the indoor part will power , keep pressing power key"for 3seconds, the device will power off. Review photo: In power mode, press"left key"or"right key"to review photos. Delete all photos: in power mode or when reviewing photos, press"left key"for three seconds to delete all photos in memory. Delete single photo: when reviewing photos, press"right key"for three seconds to delete photo in memory. Set power off time: In power mode, press"right key"for three seconds to select the power off time:15s/25s/off.