HeartSine is one of the newest AED brands on the market. They are industry innovators who provide cost-effective units with unique features. One great feature is the combined battery and AED "Pad-Pak" that reduces the number of parts that need to be checked and purchased by the AED owner. The Samaritan PAD from HeartSine is the smallest and most compact AED on the market today. Features: Compact, innovative, simple design, 5-year warranty, Pad-Pak that integrates pads and battery and easily ?clicks? into place, 3-year warranty on Pad-Pak.