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Description : This machine is automatic cycle recording. so under normal circumstances, do not delete the files, it automatically deletes the previous file. If you need to keep some important documents, you can simply change the file name. High speed recording and quick light respond. Repeat storage by section. Cycled recording. LED Indicator. Specifications: Video file:720 * 480 // CIF resolution. 30 frames/second Video formats: AVI // Recommend player: storm video, km player and so has the support of multi-format media player. support system: windows98/me/2000/xp/2003/vista; mac os; linux Working time: full power, stand by time:7 days Continuous Recording time: :4 hours working voltage:DC-5V // Charger input: AC110-240V (Optional) 50-60Hz Charger Output: DC 5.0V +/-0.5V