Plustek nDVR 540. Video compression formats: H.264, M-JPEG, Video capturing speed: 120 fps, Playback resolutions supported: NTSC: D1 (704x480), CIF(352x240), QCIF(176x120) PAL: D1 (704x576), CIF(352x288), QCIF(176x144). Hard drive interface: Serial ATA, Hard drive size: 63.5 mm (2.5 "). Compatible operating systems: Microsoft Windows XP or above. Power requirements: 12 Vdc/ 1.5 A, input: 8 ~ 16 Vdc. Operating temperature range (T-T): -20 - 65 °C, Operating relative humidity range: 20 - 80 %