Acer BeTouch E400 official Pictures. Acer BeTouch E400 is a Smartphone of acer. The Acer BeTouch E400 Android Smartphone. Announced Feb 2010. Features 3.2″ Display, Snapdragon S1 Chipset, 3.15 MP Primary Camera, 1090 MAh Battery, 256 MB RAM. Acer BeTouch E400 price starts.