Sketch Horizontal Resolution Model Features 540 TVL TD700-C540SY ◆ 1/3" SONY CCD ◆ Lens: 3.6mm Lens ( 6mm -16mm optional) ◆ Min Illumination:0.5lux ◆ High Resolution 480 TVL TD700-C480SY 420 TVL TD700-C420SY