It allows to power off module to reduce power consumption to less than 1mA in a sleep mode. Power of sleep was added to FMB965 and FMB93X devices. This is the lowest possible power consumption mode. Device goes into power off state where module is powered off to save maximum amount of power and can only wake if there is movement, external power is applied, ignition (DIN1) is detected, or it is time to make the next periodic record.