The BenQ-Siemens EF51 was announced in 2006, February With 2.2 inches, 40 x 40 mm, 15.6 cm2 (~35.7% screen-to-body ratio) TFT, 256K colors, Its 1.3 MP rear camera captured crisp photos and No video, while the Removable Li-Ion 870 mAh battery ensured long-lasting usage.