This HeartSine PAD-PAK-01 adult Pad-pak electrode and battery pack is the perfect companion to your Samaritan PAD 300, 350, 360, or 450 AED! This innovative product packages the electrode pads and the battery together as a single unit, so that you never need to track separate expiration dates for each component. Their packaged design makes replacement easy too, and gives you peace of mind in knowing that when you replace one component, you are also starting fresh with the second component. Each pack provides over 6 hours of continuous monitoring, or 30 shocks. Clear illustrations show you where to place the electrode pads. The pack has a 4 year life, and is designed for use on adult patients.