The invention relates to a child safety seat checking system for a child safety seat (10) of a vehicle, in particular a motor vehicle, comprising at least one child safety seat, a first checking device (21) for checking whether a child is located in the child safety seat, and a second checking device (11) for checking whether a person supervising the child is present, wherein the second checking device is designed to operate in an at least partly portable manner in an operating state of the child safety seat checking system and/or is designed to operate regardless of an on/off state of the vehicle.
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