Physio-Control LIFEPAK CR Plus / EXPRESS CHARGE-PAK with 2 sets of Electrode Pads (Battery, 2 sets of Electrodes, and discharger)Physio Control LIFEPAK CR Plus EXPRESS CHARGE PAK W 2 Sets Electrode Pads This replacement kit contains the following items: One CHARGE PAK charging unit Two sets of QUIK PAK pacing defibrillation ECG electrode pads CHARGE PAK discharger, which is used to safely deplete a used CHARGE PAK prior to disposal or recycling The Physio Control CR Plus LIFEPAK AED and LIFEPAK EXPRESS AED function slightly differently from other AEDs. Instead of a battery,