Product Description Specification: Physical & Performance:Unit dimensions, WxHxD1.9" x 1.9" x .7" (4.9 x 4.9 x 1.7 cm)Display size, WxH1.2” (3.1 cm) diameterDisplay type and resolution, WxHtransflective, monochrome LCD, 70 x 70 pixelsWeight3.19oz (90.6 g)BatteryRechargeable 500 mAh lithium-ionBaltery lifeup to 50..