I've got 3 of these in my house in Christchurch as security cameras.
The house had an alarm system which we prefer not to use, so I mounted 2 of them in place of the movement detectors and power them from the alarm battery. They have software built in to them which sends an email if movement is detected. Much better than a blaring alarm that everyone ignores!
They've been running for 12 months without problem.
cheers
TC