The Physio-Control LIFEPAK Pediatric pads are intended for use only with LIFEPAK 500 Biphasic AED with pink connector, LIFEPAK 1000 defibrillator, LIFEPAK EXPRESS AED, and LIFEPAK CR Plus AED. These pads are designed to be used on children less than 8 years of age or under 55 lbs. The unit requires a QUIK-COMBO connector.