Any IQ can hold a total of 16 locks at any given time. These locks can be attached directly to the IQ or through repeaters. A total of 6 repeaters can be added to an IQ, either directly to the IQ or in a linked configuration (IQ > Repeater > Repeater) to a maximum of 3 layers. Regardless of the number of repeaters, the maximum number of locks remains 16 per IQ.