HEARTSINE Adult-PAK (Patients >8 years; 55 lbs.)- These pads are so unique , they incorporate the AED battery and electrodes into one single-use cartridge making it simple to monitor with only one date for both the pads and batteries. When it is time to replace, you simply order the Pad-Pak to receive a replacement battery and pads. Both adult and child electrodes are color-coded to avoid confusion. The electrodes are designed to deliver appropriate charge for adult and child. The Adult pads are gray in color and are used for children over 8 years of age as well as adults. The pediatric pads are pink and have a smaller charge threshold for children 55lbs or less (typically children under 8 years old). The Pediatric pads are designed to deliver the appropriate shock for a small child’s heart. . The Adult pads come with a four-year life and provide 60 shocks, or six hours of continuous monitoring. When your AED is down to 10 shocks or less you will be alerted by a low battery sound. The pads have a expiration date for easy reference. It is recommended to always have a spare set of Adult Pads available in case of emergency or use.