... doorbell, Support 10 clock time.Usb functionSupport usb upload or download data, support usb upgrade function.Web serverEmbedded WEB server, users ... overtime,...). timeStress alarm functionYESPower management function Sleep, automatic shutdownUsb upload/download functionYESSelf-checking functionYESAttendance records inquiresYESDaylight saving time settingYESAlarm functionYESWeb serverEmbedded ...