Battery And One Set Defibrillation Pads In An "All-In-One" System Cartridge With Only One Expiry Date To Monitor. Each Unit Enables A Heartsine Samaritan® Pad Unit To Provide >6 Hours Of Continuous Monitoring Or 30 Shocks. The Pad Will Provide A Prompt When Battery Power Is Down To 10 Shocks Or Less. Each Pak Is Rated For 4 Years Of Use (Both Pads And Batteries) From Date Of Manufacture.