System for controlling the distance of a set of elements to a reference element. System for controlling the distance of a set of elements to a reference element; comprising: - a small electronic devices, for incorporation into a garment or portable complement by conformantes control group elements; arranging each electronic device of a unique identification code and each electronic device comprising: a microcontroller, a radio frequency transceiver, an antenna suitable to distance range with which it is required to work and the frequency of the radio signal and a battery food and, - a terminal reference or base, mobile and portable, comprising at least: a microcontroller, a radio frequency transceiver, an antenna suitable to distance range with which it is required to work and the frequency of the radio signal, a battery supply and a peripheral set that allows interaction with the user; established automatically between the reference terminal and each of the electronic devices periodic communication, radio, which determines the distance between each of the electronic devices and the reference terminal.