Headrest Monitors

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If you're worried upgrade your alternator and battery.

They wire into your fuse panel and use existing fuses. You can also run them off of the battery but you need to find out exactly how much current they draw so you can use the proper inline fuse. 3 screens probably won't draw more than 15 amps. I think mine draws like 4. This will not strain your electrical system. If you are not already having power problems then you don't need to worry about it.