diff --git a/src/o2.cpp b/src/o2.cpp
index 5f6b092..c610624 100644
--- a/src/o2.cpp
+++ b/src/o2.cpp
@@ -162,7 +162,10 @@ QString O2::grantType()
 
 void O2::setGrantType(const QString &value)
 {
+    if (grantType_ == value)
+        return;
     grantType_ = value;
+    Q_EMIT grantTypeChanged(grantType_);
 }
 
 void O2::link() {
@@ -697,7 +700,11 @@ QString O2::localhostPolicy() const {
 }
 
 void O2::setLocalhostPolicy(const QString &value) {
+    if (localhostPolicy_ == value)
+        return;
+
     localhostPolicy_ = value;
+    Q_EMIT localHostPolicyChanged(localhostPolicy_);
 }
 
 QString O2::apiKey() {
@@ -705,7 +712,11 @@ QString O2::apiKey() {
 }
 
 void O2::setApiKey(const QString &value) {
+    if (apiKey_ == value)
+        return;
+
     apiKey_ = value;
+    Q_EMIT apiKeyChanged(apiKey_);
 }
 
 bool O2::ignoreSslErrors() {
@@ -714,4 +725,5 @@ bool O2::ignoreSslErrors() {
 
 void O2::setIgnoreSslErrors(bool ignoreSslErrors) {
     timedReplies_.setIgnoreSslErrors(ignoreSslErrors);
+    Q_EMIT ignoreSslErrorsChanged(ignoreSslErrors);
 }
diff --git a/src/o2.h b/src/o2.h
index 4764912..00e2fbe 100644
--- a/src/o2.h
+++ b/src/o2.h
@@ -51,18 +51,18 @@ class O0_EXPORT O2: public O0BaseAuth
 
     /// Localhost policy. By default it's value is http://127.0.0.1:%1/, however some services may
     /// require the use of http://localhost:%1/ or any other value.
-    Q_PROPERTY(QString localhostPolicy READ localhostPolicy WRITE setLocalhostPolicy)
+    Q_PROPERTY(QString localhostPolicy READ localhostPolicy WRITE setLocalhostPolicy NOTIFY localHostPolicyChanged)
     QString localhostPolicy() const;
     void setLocalhostPolicy(const QString &value);
 
     /// API key.
-    Q_PROPERTY(QString apiKey READ apiKey WRITE setApiKey)
+    Q_PROPERTY(QString apiKey READ apiKey WRITE setApiKey NOTIFY apiKeyChanged)
     QString apiKey();
     void setApiKey(const QString &value);
 
     /// Allow ignoring SSL errors?
     /// E.g. SurveyMonkey fails on Mac due to SSL error. Ignoring the error circumvents the problem
-    Q_PROPERTY(bool ignoreSslErrors READ ignoreSslErrors WRITE setIgnoreSslErrors)
+    Q_PROPERTY(bool ignoreSslErrors READ ignoreSslErrors WRITE setIgnoreSslErrors NOTIFY ignoreSslErrorsChanged)
     bool ignoreSslErrors();
     void setIgnoreSslErrors(bool ignoreSslErrors);
 
@@ -87,7 +87,7 @@ class O0_EXPORT O2: public O0BaseAuth
     void setRefreshTokenUrl(const QString &value);
 
     /// Grant type (if non-standard)
-    Q_PROPERTY(QString grantType READ grantType WRITE setGrantType)
+    Q_PROPERTY(QString grantType READ grantType WRITE setGrantType NOTIFY grantTypeChanged)
     QString grantType();
     void setGrantType(const QString &value);
 
@@ -131,6 +131,10 @@ public Q_SLOTS:
     void extraRequestParamsChanged();
     void refreshTokenUrlChanged();
     void tokenUrlChanged();
+    void localHostPolicyChanged(const QString& policy);
+    void apiKeyChanged(const QString& key);
+    void ignoreSslErrorsChanged(bool ignore);
+    void grantTypeChanged(const QString& type);
 
 public Q_SLOTS:
     /// Handle verification response.
diff --git a/src/o2pollserver.cpp b/src/o2pollserver.cpp
index ea0dabc..f105a7e 100644
--- a/src/o2pollserver.cpp
+++ b/src/o2pollserver.cpp
@@ -43,6 +43,7 @@ int O2PollServer::interval() const
 void O2PollServer::setInterval(int interval)
 {
     pollTimer.setInterval(interval * 1000);
+    Q_EMIT intervalChanged(interval);
 }
 
 void O2PollServer::startPolling()
diff --git a/src/o2pollserver.h b/src/o2pollserver.h
index 594bc62..b826217 100644
--- a/src/o2pollserver.h
+++ b/src/o2pollserver.h
@@ -21,13 +21,14 @@ class O0_EXPORT O2PollServer : public QObject
     explicit O2PollServer(QNetworkAccessManager * manager, const QNetworkRequest &request, const QByteArray & payload, int expiresIn, QObject *parent = nullptr);
 
     /// Seconds to wait between polling requests
-    Q_PROPERTY(int interval READ interval WRITE setInterval)
+    Q_PROPERTY(int interval READ interval WRITE setInterval NOTIFY intervalChanged)
     int interval() const;
     void setInterval(int interval);
 
 Q_SIGNALS:
     void verificationReceived(QMap<QString, QString>);
     void serverClosed(bool); // whether it has found parameters
+    void intervalChanged(int interval);
 
 public Q_SLOTS:
     void startPolling();
diff --git a/src/o2replyserver.cpp b/src/o2replyserver.cpp
index 87ebaab..a2611bd 100755
--- a/src/o2replyserver.cpp
+++ b/src/o2replyserver.cpp
@@ -152,7 +152,10 @@ QByteArray O2ReplyServer::replyContent() {
 }
 
 void O2ReplyServer::setReplyContent(const QByteArray &value) {
-  replyContent_ = value;
+    if (replyContent_ == value)
+        return;
+    replyContent_ = value;
+    Q_EMIT replyContentChanged();
 }
 
 int O2ReplyServer::timeout()
@@ -162,7 +165,11 @@ int O2ReplyServer::timeout()
 
 void O2ReplyServer::setTimeout(int timeout)
 {
-  timeout_ = timeout;
+    if ( timeout_ == timeout )
+        return;
+
+    timeout_ = timeout;
+    Q_EMIT timeoutChanged(timeout_);
 }
 
 int O2ReplyServer::callbackTries()
@@ -172,7 +179,11 @@ int O2ReplyServer::callbackTries()
 
 void O2ReplyServer::setCallbackTries(int maxtries)
 {
-  maxtries_ = maxtries;
+    if (maxtries_ == maxtries)
+        return;
+
+    maxtries_ = maxtries;
+    Q_EMIT callbackTriesChanged(maxtries_);
 }
 
 QString O2ReplyServer::uniqueState()
diff --git a/src/o2replyserver.h b/src/o2replyserver.h
index e6b9c44..8e2649b 100644
--- a/src/o2replyserver.h
+++ b/src/o2replyserver.h
@@ -16,17 +16,17 @@ class O0_EXPORT O2ReplyServer: public QTcpServer {
     explicit O2ReplyServer(QObject *parent = nullptr);
 
     /// Page content on local host after successful oauth - in case you do not want to close the browser, but display something
-    Q_PROPERTY(QByteArray replyContent READ replyContent WRITE setReplyContent)
+    Q_PROPERTY(QByteArray replyContent READ replyContent WRITE setReplyContent NOTIFY replyContentChanged)
     QByteArray replyContent();
     void setReplyContent(const QByteArray &value);
 
     /// Seconds to keep listening *after* first response for a callback with token content
-    Q_PROPERTY(int timeout READ timeout WRITE setTimeout)
+    Q_PROPERTY(int timeout READ timeout WRITE setTimeout NOTIFY timeoutChanged)
     int timeout();
     void setTimeout(int timeout);
 
     /// Maximum number of callback tries to accept, in case some don't have token content (favicons, etc.)
-    Q_PROPERTY(int callbackTries READ callbackTries WRITE setCallbackTries)
+    Q_PROPERTY(int callbackTries READ callbackTries WRITE setCallbackTries NOTIFY callbackTriesChanged)
     int callbackTries();
     void setCallbackTries(int maxtries);
 
@@ -36,6 +36,9 @@ class O0_EXPORT O2ReplyServer: public QTcpServer {
 Q_SIGNALS:
     void verificationReceived(QMap<QString, QString>);
     void serverClosed(bool); // whether it has found parameters
+    void replyContentChanged();
+    void timeoutChanged(int timeout);
+    void callbackTriesChanged(int maxtries);
 
 public Q_SLOTS:
     void onIncomingConnection();