7 of 7 people found the following review helpful
Um, it's a battery,
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This review is from: 12V 4 Ah Sealed Lead Acid Replacement Battery for DIGITAL SECURITY CONTROLS DSC BD4-12 (Camera)
Was happy to find this on Amazon, a visit to our local "electronics superstore" turned up nothing. The battery in our home alarm system was dying (and setting off the alarm every 12 hours, tons of fun). Thankfully this arrived in a few days and did the trick. It took about 12 hours for the "system battery low" warning to stop, I think the system had to reset itself. Oh, and we totally had to get a locksmith to open the alarm box after losing the key. Awesome.