They are both battery powered. If the battery on the red dot fails you are screwed unless you have a firearm with immediate access back up sights. If the laser quits you still have your irons. Lasers are also good training aids but dont get dependent on them. They can help you smooth out your trigger pull.
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"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.