Must be plugged into an outside outlet to keep the battery charged. Works well and was very easy to install. My camera is high under the ceiling and I had to constantly change the battery using a ladder due to its high activity. Now the battery is always charged. I plugged it into an outside outlet but even if someone unplugged it the battery would be well charged, so for security reasons it doesn't matter if a thief tries to unplug the power adapter, you'll still have power for days on a fully charged battery !
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