diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 7e05e3d..f3b16b8 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        qt-ver: [5.15.0]
+        qt-ver: [5.15.1]
         qt-arch-install: [clang_64]
         clang-arch: [x64]
     env:
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index cd7e846..50dc8fd 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-16.04,ubuntu-18.04]
-        qt-ver: [5.15.0]
+        qt-ver: [5.15.1]
         qt-arch-install: [gcc_64]
         gcc-arch: [x64]
     env:
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 834320b..1e43fb8 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -22,7 +22,7 @@ jobs:
     # 矩阵配置 https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix
     strategy:
       matrix:
-        qt-ver: [5.15.0]
+        qt-ver: [5.15.1]
         qt-arch: [win64_msvc2019_64, win32_msvc2019]
         # 配置qt-arch的额外设置msvc-arch，qt-arch-install
         include:
diff --git a/QtScrcpy/QtScrcpy.pro b/QtScrcpy/QtScrcpy.pro
index c947acc..0afdc4e 100644
--- a/QtScrcpy/QtScrcpy.pro
+++ b/QtScrcpy/QtScrcpy.pro
@@ -48,6 +48,10 @@ HEADERS += \
 FORMS += \
         dialog.ui
 
+# 试用检查
+# DEFINES += TRIAL_EXPIRE_CHECK
+DEFINES += TRIAL_TIMES=10
+
 # 子工程
 include ($$PWD/common/common.pri)
 include ($$PWD/adb/adb.pri)
diff --git a/QtScrcpy/device/ui/videoform.cpp b/QtScrcpy/device/ui/videoform.cpp
index 282bc16..36a6ef4 100644
--- a/QtScrcpy/device/ui/videoform.cpp
+++ b/QtScrcpy/device/ui/videoform.cpp
@@ -343,6 +343,16 @@ QRect VideoForm::getScreenRect()
     return screenRect;
 }
 
+bool VideoForm::checkTrialExpire()
+{
+    static int trialTimes = 0;
+    if (++trialTimes > TRIAL_TIMES) {
+        QMessageBox::warning(this, "QtScrcpy", QStringLiteral("试用已结束，购买正式版本请联系作者"), QMessageBox::Ok);
+        return true;
+    }
+    return false;
+}
+
 void VideoForm::updateStyleSheet(bool vertical)
 {
     if (vertical) {
@@ -500,6 +510,12 @@ void VideoForm::setDevice(Device *device)
 
 void VideoForm::mousePressEvent(QMouseEvent *event)
 {
+#ifdef TRIAL_EXPIRE_CHECK
+    if (checkTrialExpire()) {
+        return;
+    }
+#endif
+
     if (event->button() == Qt::MiddleButton) {
         if (m_device && !m_device->isCurrentCustomKeymap()) {
             emit m_device->postGoHome();
diff --git a/QtScrcpy/device/ui/videoform.h b/QtScrcpy/device/ui/videoform.h
index bda37a4..0b07c0c 100644
--- a/QtScrcpy/device/ui/videoform.h
+++ b/QtScrcpy/device/ui/videoform.h
@@ -45,6 +45,7 @@ private:
     void moveCenter();
     void installShortcut();
     QRect getScreenRect();
+    bool checkTrialExpire();
 
 protected:
     void mousePressEvent(QMouseEvent *event);
diff --git a/QtScrcpy/devicemanage/devicemanage.cpp b/QtScrcpy/devicemanage/devicemanage.cpp
index 7c47c81..6df5878 100644
--- a/QtScrcpy/devicemanage/devicemanage.cpp
+++ b/QtScrcpy/devicemanage/devicemanage.cpp
@@ -7,7 +7,7 @@
 #include "server.h"
 #include "videoform.h"
 
-#define DM_MAX_DEVICES_NUM 16
+#define DM_MAX_DEVICES_NUM 1000
 
 DeviceManage::DeviceManage(QObject *parent) : QObject(parent) {}
 
diff --git a/README.md b/README.md
index 3944faa..6427b5d 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,6 @@
 ![license](https://img.shields.io/badge/license-Apache2.0-blue.svg)
 ![release](https://img.shields.io/github/v/release/barry-ran/QtScrcpy.svg)
 
-<a href="https://tracking.gitads.io/?repo=QtScrcpy"><img src="https://images.gitads.io/QtScrcpy" alt="GitAds"/></a>
-
 [中文介绍](README_zh.md)
 
 QtScrcpy connects to Android devices via USB (or via TCP/IP) for display and control. It does NOT require the root privileges.