diff --git a/src/main/java/cz/smarteon/loxone/message/LoxoneMessageCommand.java b/src/main/java/cz/smarteon/loxone/message/LoxoneMessageCommand.java
index b00aed24..7798c588 100644
--- a/src/main/java/cz/smarteon/loxone/message/LoxoneMessageCommand.java
+++ b/src/main/java/cz/smarteon/loxone/message/LoxoneMessageCommand.java
@@ -247,6 +247,16 @@ public static LoxoneMessageCommand<OneWireDetails> oneWireDetails(final @NotNull
                 OneWireDetails.class, MiniserverType.KNOWN);
     }
 
+    /**
+     * Get 1-wire details of MultiExtensionAir by given extension serial number.
+     * @param extensionSerial serial number of MultiExtensionAir extension
+     * @return command requesting 1-wire details
+     */
+    public static LoxoneMessageCommand<OneWireDetails> multiExtensionAirOneWireDetails(final @NotNull String extensionSerial) {
+        return jsonCommand("jdev/sys/wsdevice/" + requireNonNull(extensionSerial, "extensionSerial can't be null") + "/Statistics",
+                OneWireDetails.class, MiniserverType.KNOWN);
+    }
+
     private static <V extends LoxoneValue> LoxoneMessageCommand<V> jsonCommand(
             final String command, final Class<V> valueType, final MiniserverType[] supportedMiniservers) {
         return new LoxoneMessageCommand<>(command, Type.JSON, valueType, true, true, supportedMiniservers);
diff --git a/src/main/java/cz/smarteon/loxone/message/OneWireDetails.java b/src/main/java/cz/smarteon/loxone/message/OneWireDetails.java
index 11ecd45d..45c1d7a2 100644
--- a/src/main/java/cz/smarteon/loxone/message/OneWireDetails.java
+++ b/src/main/java/cz/smarteon/loxone/message/OneWireDetails.java
@@ -161,7 +161,7 @@ public int hashCode() {
     public static class Deserializer extends JsonDeserializer<OneWireDetails> {
 
         private static final Pattern ONE_WIRE_DETAIL_PATTERN = Pattern.compile(
-                "^1-Wire\\s+Serial\\s+([0-9A-F.]+):\\s+(\\d+)\\s+Packet Requests,"
+                "^(?:1-Wire\\s+)?Serial\\s+([0-9A-F.]+):\\s+(\\d+)\\s+Packet Requests,"
                         + "\\s+(\\d+)\\s+CRC Errors,\\s+(\\d+)\\s+85 Degree Problems$");
         @Override
         public OneWireDetails deserialize(
diff --git a/src/main/java/cz/smarteon/loxone/system/status/Device.java b/src/main/java/cz/smarteon/loxone/system/status/Device.java
index 5895fbf9..d5a377b8 100644
--- a/src/main/java/cz/smarteon/loxone/system/status/Device.java
+++ b/src/main/java/cz/smarteon/loxone/system/status/Device.java
@@ -37,4 +37,18 @@ public String getName() {
     public String getSerialNumber() {
         return serialNumber;
     }
+
+    /**
+     * Serial number transformed for use with 'wsdevice' commands.
+     * @return serial number for 'wsdevice' commands.
+     * @see cz.smarteon.loxone.message.LoxoneMessageCommand#oneWireDetails(String)
+     */
+    @Nullable
+    public String getSerialForCommands() {
+        if (getSerialNumber() != null) {
+            return getSerialNumber().replaceAll(":", "");
+        } else {
+            return null;
+        }
+    }
 }
diff --git a/src/main/java/cz/smarteon/loxone/system/status/MultiExtensionAir.java b/src/main/java/cz/smarteon/loxone/system/status/MultiExtensionAir.java
index 111d18da..ca7527f2 100644
--- a/src/main/java/cz/smarteon/loxone/system/status/MultiExtensionAir.java
+++ b/src/main/java/cz/smarteon/loxone/system/status/MultiExtensionAir.java
@@ -23,12 +23,13 @@ public List<OneWireDevice> getDevices() {
     /**
      * Serial number transformed to the form for getting one wire details.
      * @return serial number for one wire details command.
-     * @see cz.smarteon.loxone.message.LoxoneMessageCommand#oneWireDetails(String)
+     * @see cz.smarteon.loxone.message.LoxoneMessageCommand#multiExtensionAirOneWireDetails(String)
      */
     @NotNull
     public String getSerialForOneWireDetails() {
-        if (getSerialNumber() != null) {
-            return getSerialNumber().replaceAll(":", "").substring(8).toLowerCase();
+        final String serial = getSerialForCommands();
+        if (serial != null) {
+            return serial;
         } else {
             throw new IllegalStateException("MultiExtensionAir must have set serial number");
         }
diff --git a/src/test/kotlin/system/status/MiniserverStatusTest.kt b/src/test/kotlin/system/status/MiniserverStatusTest.kt
index 5dc430b4..6b3c222f 100644
--- a/src/test/kotlin/system/status/MiniserverStatusTest.kt
+++ b/src/test/kotlin/system/status/MiniserverStatusTest.kt
@@ -91,7 +91,7 @@ class MiniserverStatusTest {
 
         expectThat(airBaseExtensions[0].devices[2] as MultiExtensionAir) {
             get { devices }.hasSize(3)
-            get { serialForOneWireDetails }.isEqualTo("fe894bc6")
+            get { serialForOneWireDetails }.isEqualTo("504F94FFFE894BC6")
         }
 
         val treeExtensions = ms.getExtensions(TreeExtension::class.java)
diff --git a/src/test/resources/message/oneWireDetails.json b/src/test/resources/message/oneWireDetails.json
index 161fd08a..9f0c0eca 100644
--- a/src/test/resources/message/oneWireDetails.json
+++ b/src/test/resources/message/oneWireDetails.json
@@ -1,3 +1,3 @@
 "
 1-Wire Serial 28.BB.CE.AD.07.00.00.2F: 2709 Packet Requests, 0 CRC Errors, 0 85 Degree Problems;
-1-Wire Serial 28.62.A9.AC.0A.00.00.A2: 13 Packet Requests, 1230000 CRC Errors, 5 85 Degree Problems; "
\ No newline at end of file
+Serial 28.62.A9.AC.0A.00.00.A2: 13 Packet Requests, 1230000 CRC Errors, 5 85 Degree Problems; "