Source: http://www.hikvisioneurope.com/portal/portal/Technical%20Materials/00%20%20Network%20Camera/02%20%20Product%20User%20Manuals%20%28multi-language%29/05-French/51%20Guides%20et%20Manuels%20d%27utilisateur/514%20-%20Nouvelle%20Manuels%20d%27utilisateur%202018/2_UD08250B_Baseline_User%20Manual%20of%20iVMS-4200_V2.7_20171127-French.pdf