HeartSine Samaritan PadPak (Adults) - 2-in-1 battery & electrodesThis PadPak is a combination of electrodes and batteries, so you do not have to replace them separately. Once a bet has been made, you must replace the PadPak completely. Even if the date on the PadPak has expired, you should replace it.Suitable for Samaritan 300P, Samaritan 350P, Samaritan 360P, Samaritan 500P.