Offering all the great advantages of the SAM 350P, the SAM 450P features our new integrated CPR Rate Advisor™, which monitors the rate of CPR chest compressions administered by the rescuer -- using just our standard electrodes -- and provides real-time audio-visual feedback to the rescuer on the rate of compressions. The SAM 450P with CPR Rate Advisor accompanies the rescuer right through the chain of survival, helping to ensure CPR is continuously performed at an effective rate and delivering a shock when necessary.