GeekBuying.com has S7 5.8-inch Car OBDII HUD Head Up Display Projector with Speed Warning System on sale for $49.99.
Shipping is free.
Plug and play, HUD can auto adapt to vehicle type which in line with OBDII or EU OBD ( On-Board Diagnostic System )
Comprehensive display, HUD can display many parameters at the same time such as vehicle speed, engine speed, low voltage alarm, high temperature alarm, speed alarm, free switching between kilometer and mile, free switching between centigrade and fahrenheit
Suitable size, the display area is 3 inches which is very clear for driver to read data
Flexible brightness adjustment, the brightness can be adjusted automatically or manually to reach the best state which is in harmony with the environment.
Automatic power on and off, starting with the vehicle starting, stopping with the vehicle stopping to protect the vehicle’s battery.