The bell smart home battery pack is the perfect addition to your security & control panel that provides you with long lasting secure power. This battery pack can be used as a replacement for your existing battery. Features voltage: 12 volts capacity: 4500mah rechargeable sealed lead acid alarm battery replacement battery for: c&k 236, c&k 238, 5800c2w (lynx hardwired to wireless converter), dsc classic series (pc 1000, 1500, 1550) includes instructions for the installation of your bell smart home devices