A power-saving system for a computer peripheral includes a computer, a power switch controller and a computer peripheral. The heart stimulator is adapted to generate right chamber stimulation pulses for a right atrium or ventricle and left chamber stimulation pulses for a left ventricle or atrium. The semiconductor chip has a circuit, a plurality of electrode pads electrically connected to the circuit, and a plurality of through electrodes. When the communication link between the central rental facility and the remote computer is interrupted or terminated, the application software no longer executes on the remote computer. In particular, the present invention discloses fibrosis specific multimeric small-molecule peptidomimetic radiotracers.