So you would like to send a message others on the road while driving? The Ototok has you covered. It is a smartphone controlled LED car sign that lets you tell others anything through your smartphone. Simply install the device, download the companion iOS or Android app, pair your phone to the Ototok, and write what you want to communicate.
More gadgets like this: here
The device can also be controlled using a RF remote. It is readable in sunlight up to 30 feet.
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