diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -51,16 +51,18 @@
 
     addEntry();
 
-    connect(ui->addButton, SIGNAL(clicked()), this, SLOT(addEntry()));
-    connect(ui->clearButton, SIGNAL(clicked()), this, SLOT(clear()));
+    connect(ui->addButton, &QPushButton::clicked, this,
+            &SendCoinsDialog::addEntry);
+    connect(ui->clearButton, &QPushButton::clicked, this,
+            &SendCoinsDialog::clear);
 
     // Coin Control
-    connect(ui->pushButtonCoinControl, SIGNAL(clicked()), this,
-            SLOT(coinControlButtonClicked()));
-    connect(ui->checkBoxCoinControlChange, SIGNAL(stateChanged(int)), this,
-            SLOT(coinControlChangeChecked(int)));
-    connect(ui->lineEditCoinControlChange, SIGNAL(textEdited(const QString &)),
-            this, SLOT(coinControlChangeEdited(const QString &)));
+    connect(ui->pushButtonCoinControl, &QPushButton::clicked, this,
+            &SendCoinsDialog::coinControlButtonClicked);
+    connect(ui->checkBoxCoinControlChange, &QCheckBox::stateChanged, this,
+            &SendCoinsDialog::coinControlChangeChecked);
+    connect(ui->lineEditCoinControlChange, &QValidatedLineEdit::textEdited,
+            this, &SendCoinsDialog::coinControlChangeEdited);
 
     // Coin Control: clipboard actions
     QAction *clipboardQuantityAction = new QAction(tr("Copy quantity"), this);
@@ -70,20 +72,20 @@
     QAction *clipboardBytesAction = new QAction(tr("Copy bytes"), this);
     QAction *clipboardLowOutputAction = new QAction(tr("Copy dust"), this);
     QAction *clipboardChangeAction = new QAction(tr("Copy change"), this);
-    connect(clipboardQuantityAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardQuantity()));
-    connect(clipboardAmountAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardAmount()));
-    connect(clipboardFeeAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardFee()));
-    connect(clipboardAfterFeeAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardAfterFee()));
-    connect(clipboardBytesAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardBytes()));
-    connect(clipboardLowOutputAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardLowOutput()));
-    connect(clipboardChangeAction, SIGNAL(triggered()), this,
-            SLOT(coinControlClipboardChange()));
+    connect(clipboardQuantityAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardQuantity);
+    connect(clipboardAmountAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardAmount);
+    connect(clipboardFeeAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardFee);
+    connect(clipboardAfterFeeAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardAfterFee);
+    connect(clipboardBytesAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardBytes);
+    connect(clipboardLowOutputAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardLowOutput);
+    connect(clipboardChangeAction, &QAction::triggered, this,
+            &SendCoinsDialog::coinControlClipboardChange);
     ui->labelCoinControlQuantity->addAction(clipboardQuantityAction);
     ui->labelCoinControlAmount->addAction(clipboardAmountAction);
     ui->labelCoinControlFee->addAction(clipboardFeeAction);
@@ -148,9 +150,8 @@
     this->clientModel = _clientModel;
 
     if (_clientModel) {
-        connect(_clientModel,
-                SIGNAL(numBlocksChanged(int, QDateTime, double, bool)), this,
-                SLOT(updateSmartFeeLabel()));
+        connect(_clientModel, &ClientModel::numBlocksChanged, this,
+                &SendCoinsDialog::updateSmartFeeLabel);
     }
 }
 
@@ -168,37 +169,43 @@
 
         interfaces::WalletBalances balances = _model->wallet().getBalances();
         setBalance(balances);
-        connect(_model, SIGNAL(balanceChanged(interfaces::WalletBalances)),
-                this, SLOT(setBalance(interfaces::WalletBalances)));
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
-                this, SLOT(updateDisplayUnit()));
+        connect(_model, &WalletModel::balanceChanged, this,
+                &SendCoinsDialog::setBalance);
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged,
+                this, &SendCoinsDialog::updateDisplayUnit);
         updateDisplayUnit();
 
         // Coin Control
-        connect(_model->getOptionsModel(), SIGNAL(displayUnitChanged(int)),
-                this, SLOT(coinControlUpdateLabels()));
+        connect(_model->getOptionsModel(), &OptionsModel::displayUnitChanged,
+                this, &SendCoinsDialog::coinControlUpdateLabels);
         connect(_model->getOptionsModel(),
-                SIGNAL(coinControlFeaturesChanged(bool)), this,
-                SLOT(coinControlFeatureChanged(bool)));
+                &OptionsModel::coinControlFeaturesChanged, this,
+                &SendCoinsDialog::coinControlFeatureChanged);
         ui->frameCoinControl->setVisible(
             _model->getOptionsModel()->getCoinControlFeatures());
         coinControlUpdateLabels();
 
         // fee section
-        connect(ui->groupFee, SIGNAL(buttonClicked(int)), this,
-                SLOT(updateFeeSectionControls()));
-        connect(ui->groupFee, SIGNAL(buttonClicked(int)), this,
-                SLOT(coinControlUpdateLabels()));
-        connect(ui->groupCustomFee, SIGNAL(buttonClicked(int)), this,
-                SLOT(coinControlUpdateLabels()));
-        connect(ui->customFee, SIGNAL(valueChanged()), this,
-                SLOT(coinControlUpdateLabels()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
-                SLOT(setMinimumFee()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
-                SLOT(updateFeeSectionControls()));
-        connect(ui->checkBoxMinimumFee, SIGNAL(stateChanged(int)), this,
-                SLOT(coinControlUpdateLabels()));
+        connect(ui->groupFee,
+                static_cast<void (QButtonGroup::*)(int)>(
+                    &QButtonGroup::buttonClicked),
+                this, &SendCoinsDialog::updateFeeSectionControls);
+        connect(ui->groupFee,
+                static_cast<void (QButtonGroup::*)(int)>(
+                    &QButtonGroup::buttonClicked),
+                this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->groupCustomFee,
+                static_cast<void (QButtonGroup::*)(int)>(
+                    &QButtonGroup::buttonClicked),
+                this, &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->customFee, &BitcoinAmountField::valueChanged, this,
+                &SendCoinsDialog::coinControlUpdateLabels);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this,
+                &SendCoinsDialog::setMinimumFee);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this,
+                &SendCoinsDialog::updateFeeSectionControls);
+        connect(ui->checkBoxMinimumFee, &QCheckBox::stateChanged, this,
+                &SendCoinsDialog::coinControlUpdateLabels);
 
         ui->customFee->setSingleStep(model->wallet().getRequiredFee(1000));
         updateFeeSectionControls();
@@ -427,14 +434,14 @@
 SendCoinsEntry *SendCoinsDialog::addEntry() {
     SendCoinsEntry *entry = new SendCoinsEntry(platformStyle, model, this);
     ui->entries->addWidget(entry);
-    connect(entry, SIGNAL(removeEntry(SendCoinsEntry *)), this,
-            SLOT(removeEntry(SendCoinsEntry *)));
-    connect(entry, SIGNAL(useAvailableBalance(SendCoinsEntry *)), this,
-            SLOT(useAvailableBalance(SendCoinsEntry *)));
-    connect(entry, SIGNAL(payAmountChanged()), this,
-            SLOT(coinControlUpdateLabels()));
-    connect(entry, SIGNAL(subtractFeeFromAmountChanged()), this,
-            SLOT(coinControlUpdateLabels()));
+    connect(entry, &SendCoinsEntry::removeEntry, this,
+            &SendCoinsDialog::removeEntry);
+    connect(entry, &SendCoinsEntry::useAvailableBalance, this,
+            &SendCoinsDialog::useAvailableBalance);
+    connect(entry, &SendCoinsEntry::payAmountChanged, this,
+            &SendCoinsDialog::coinControlUpdateLabels);
+    connect(entry, &SendCoinsEntry::subtractFeeFromAmountChanged, this,
+            &SendCoinsDialog::coinControlUpdateLabels);
 
     // Focus the field, so that entry can start immediately
     entry->clear();
@@ -916,7 +923,8 @@
     setDefaultButton(QMessageBox::Cancel);
     yesButton = button(QMessageBox::Yes);
     updateYesButton();
-    connect(&countDownTimer, SIGNAL(timeout()), this, SLOT(countDown()));
+    connect(&countDownTimer, &QTimer::timeout, this,
+            &SendConfirmationDialog::countDown);
 }
 
 int SendConfirmationDialog::exec() {