Join / Sign In Roadshow editors pick the products and services we write about. When you buy through our links, we may get a commission. Best Android Auto head unit car stereos for 2021 Upgrade your infotainment system with an Android Auto head unit. We've found the best single DIN, big screen, wireless and affordable Android car stereo options available. Chief among the many good reasons to upgrade your vehicle's stereo head unit is smartphone integration -- you don't need a new car to experience it, either. Android Auto adds voice commands, which makes easier to send texts, navigate, take calls and more. Since Android Auto's debut in 2015, aftermarket stereo manufacturers have been designing head units with Google's automotive OS to fit a variety of cars.