So you would like to display symbols and messages in the back of your car? This app controlled Car LED Display has you covered. It connects to your phone via Bluetooth and lets you display messages, symbols and emojis. You can create and display your own drawings in real-time.
The device is compatible with iOS/Android devices. It has 8 different modes an comes with symbols such as heart, phone, star, no smoking, and 8 messages right off the bat.