Powered by 1 x CR2032 battery (included)GeneralBrand：ACCUColor：BlackMaterial：Aluminum alloyQuantity：1PieceSpecificationGun Type：Suitable for 20mm rail gunMagnification：1XObjective Diameter：30mmExit Pupil Diameter：3cmEye Relief：4~6cmLaser Wavelength：NOLaser Color：Red，GreenDimensions & WeightDimensions：4.57 in x 2.68 in x 2.2 in (11.6 cm x 6.8 cm x 5.6 cm)Weight：7.69 oz (218 g)Packing List1 x Sight 1 x Cleaning cloth 2 x CR2032 cell batteries<img src="http://112.74.112.28/down/products/277491/277491_000.jpg">