diff --git a/SleepLib/loader_plugins/prs1_loader.cpp b/SleepLib/loader_plugins/prs1_loader.cpp
index 03f65c6d..96cda4e5 100644
--- a/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/SleepLib/loader_plugins/prs1_loader.cpp
@@ -185,7 +185,7 @@ bool PRS1Loader::ParseProperties(Machine *m,QString filename)
     }
     bool ok;
     QString pt=prop["ProductType"];
-    int i=pt.toInt(&ok,0);
+    int i=pt.toInt(&ok,16);
     if (ok) {
         if (ModelMap.find(i)!=ModelMap.end()) {
             m->properties["SubModel"]=ModelMap[i];
@@ -1211,9 +1211,9 @@ bool PRS1Loader::OpenWaveforms(Session *session,QString filename)
 
 void InitModelMap()
 {
-    ModelMap[34]="RemStar Pro with C-Flex+";
-    ModelMap[35]="RemStar Auto with A-Flex";
-    ModelMap[37]="RemStar BiPAP Auto with Bi-Flex";
+    ModelMap[0x34]="RemStar Pro with C-Flex+";
+    ModelMap[0x35]="RemStar Auto with A-Flex";
+    ModelMap[0x37]="RemStar BiPAP Auto with Bi-Flex";
     ModelMap[0x41]="BiPAP autoSV Advanced";
 };
 
diff --git a/preferencesdialog.ui b/preferencesdialog.ui
index a2964caa..f15e1b27 100644
--- a/preferencesdialog.ui
+++ b/preferencesdialog.ui
@@ -29,7 +29,7 @@
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
-      <number>0</number>
+      <number>5</number>
      </property>
      <widget class="QWidget" name="visualTab">
       <attribute name="title">
@@ -808,6 +808,89 @@ p, li { white-space: pre-wrap; }
        </item>
       </layout>
      </widget>
+     <widget class="QWidget" name="oximetryTab">
+      <attribute name="title">
+       <string>Oximetry</string>
+      </attribute>
+      <layout class="QVBoxLayout" name="verticalLayout_6">
+       <item>
+        <widget class="QLabel" name="label_21">
+         <property name="text">
+          <string>Yet another work in progress...</string>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Use Oximetry</string>
+         </property>
+         <property name="checkable">
+          <bool>true</bool>
+         </property>
+         <layout class="QFormLayout" name="formLayout">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label_20">
+            <property name="sizePolicy">
+             <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+              <horstretch>0</horstretch>
+              <verstretch>0</verstretch>
+             </sizepolicy>
+            </property>
+            <property name="text">
+             <string>Type</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <layout class="QHBoxLayout" name="horizontalLayout_7">
+            <item>
+             <widget class="QComboBox" name="comboBox">
+              <item>
+               <property name="text">
+                <string>Contec CMS50</string>
+               </property>
+              </item>
+              <item>
+               <property name="text">
+                <string>Overpriced ResMed S9 Oximeter</string>
+               </property>
+              </item>
+             </widget>
+            </item>
+            <item>
+             <widget class="QCheckBox" name="checkBox">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="text">
+               <string>Sync with CPAP where possible</string>
+              </property>
+             </widget>
+            </item>
+           </layout>
+          </item>
+          <item row="1" column="1">
+           <spacer name="verticalSpacer_3">
+            <property name="orientation">
+             <enum>Qt::Vertical</enum>
+            </property>
+            <property name="sizeHint" stdset="0">
+             <size>
+              <width>434</width>
+              <height>101</height>
+             </size>
+            </property>
+           </spacer>
+          </item>
+         </layout>
+        </widget>
+       </item>
+      </layout>
+     </widget>
     </widget>
    </item>
    <item>