Review of a 12V splitter. This is also called a 3-way cigarette lighter adapter .
This adapter plugs into a single 12V battery outlet and splits it into three outlets. Could be used to power three gadgets from your car or from wherever else you have a 12V outlet. I have one in my house for off-the-grid backup power.
Video review…
This adapter allows you to power up three items from a single 12V source. In the video above, I powered up a cell phone, a bluetooth transmitter, and an Arduino circuit board.

Powering an Arduino board with a 12V battery
I bought this item from MPJA Online. I have ordered a few things from them now and am impressed with their fast shipping and cheap prices. Their price for this item is $6 plus shipping. (I am not being compensated in any way for this review. This post is just for information sharing.)
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