Abstract: A safety system for an object having a transmitter that comprises a microcontroller to generate an identification signal having a given frequency and a resonant circuit to amplify the signal. The transmitter is suitable to be placed in the vicinity of the body of a person to capacitively couple the identification signal to it. The safety system also comprises a receiver suitable to be capacitively coupled to the body in order to receive the first identification signal and to recognize based on the identification signal if a user is an authorized user. The safety system estimates the actual resonant frequency of the resonant circuit when the circuit is amplifying the signal and the microcontroller is adapted to choose as frequency for the identification signal the closest frequency to the estimated actual resonant circuit it can generate so that the amplification of the identification signal is maximized.