CALC-DVR32 Sony CCD 480 TVL Up to 8 Hours Recording 320 x 240 Image Resolution MPEG-4 Compression CSDDVR-WF Support 20 channels online Support RS-485 and RS-232 1~4 channel BNC MPEG4 & H.264 compression   CSDRDVR35-H 1/3" color CCD image sensor Memory Full Overwrite Pinhole Lens Mpeg4 Compression CTBX-DVR 480TVL SONY CCD 1 CH Composite Video 0.001 LUX Min Illumintation MPEG4-SPASF File Format   CTBX-DVRWF 1/3" CCD 480 TVL Support 32GB SD card D1 640 x 480 Recording H.264 Compression WatchCam Pro Full HD 1080P Video Support Night Vision Recording Pictures in 4032 x 3024 Built-In HD PC WebCam

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