The Acer Allegro was announced in 2011, October. Released 2011, November With 3.6 inches, 36.9 cm2 (~53.9% screen-to-body ratio) TFT, Powered by Qualcomm MSM8255 Snapdragon S2 and running Microsoft Windows Phone 7.5 Mango, the device delivered smooth performance and multitasking capabilities. Its 5 MP, AF rear camera captured crisp photos and Yes video, while the Removable Li-Ion 1300 mAh battery ensured long-lasting usage.