diff --git a/Controllers/LogitechController/LogitechG203Controller.cpp b/Controllers/LogitechController/LogitechG203Controller.cpp
index 26197285..5a3d87c2 100644
--- a/Controllers/LogitechController/LogitechG203Controller.cpp
+++ b/Controllers/LogitechController/LogitechG203Controller.cpp
@@ -23,7 +23,7 @@ LogitechG203Controller::LogitechG203Controller(hid_device* dev_handle)
 void LogitechG203Controller::SendMouseMode
     (
     unsigned char       mode,
-    unsigned char       speed,
+    unsigned short      speed,
     unsigned char       red,
     unsigned char       green,
     unsigned char       blue
@@ -51,6 +51,20 @@ void LogitechG203Controller::SendMouseMode
     usb_buf[0x07]           = green;
     usb_buf[0x08]           = blue;
 
+    speed = 1000 + 4750 * (LOGITECH_G203_SPEED_FASTEST - speed);
+    if(mode == LOGITECH_G203_MODE_CYCLE)
+    {
+        usb_buf[0x0B]   = speed >> 8;
+        usb_buf[0x0C]   = speed & 0xFF;
+        usb_buf[0x0D]   = 0x64;
+    }
+    else if(mode == LOGITECH_G203_MODE_BREATHING)
+    {
+        usb_buf[0x09]   = speed >> 8;
+        usb_buf[0x0A]   = speed & 0xFF;
+        usb_buf[0x0C]   = 0x64;
+    }
+
     /*-----------------------------------------------------*\
     | Send packet                                           |
     \*-----------------------------------------------------*/
diff --git a/Controllers/LogitechController/LogitechG203Controller.h b/Controllers/LogitechController/LogitechG203Controller.h
index 231dd4ee..883c8a0b 100644
--- a/Controllers/LogitechController/LogitechG203Controller.h
+++ b/Controllers/LogitechController/LogitechG203Controller.h
@@ -22,6 +22,15 @@ enum
     LOGITECH_G203_MODE_BREATHING         = 0x03,
 };
 
+enum
+{
+    LOGITECH_G203_SPEED_SLOWEST          = 0x00, /* Slowest speed                */
+    LOGITECH_G203_SPEED_SLOW             = 0x01, /* Slow speed                   */
+    LOGITECH_G203_SPEED_NORMAL           = 0x02, /* Normal speed                 */
+    LOGITECH_G203_SPEED_FAST             = 0x03, /* Fast speed                   */
+    LOGITECH_G203_SPEED_FASTEST          = 0x04, /* Fastest speed                */
+};
+
 class LogitechG203Controller
 {
 public:
@@ -31,7 +40,7 @@ public:
     void        SendMouseMode
                    (
                    unsigned char       mode,
-                   unsigned char       speed,
+                   unsigned short      speed,
                    unsigned char       red,
                    unsigned char       green,
                    unsigned char       blue
diff --git a/Controllers/LogitechController/LogitechG403Controller.h b/Controllers/LogitechController/LogitechG403Controller.h
index 9f930791..df492f62 100644
--- a/Controllers/LogitechController/LogitechG403Controller.h
+++ b/Controllers/LogitechController/LogitechG403Controller.h
@@ -40,7 +40,7 @@ public:
     void        SendMouseMode
                    (
                     unsigned char       mode,
-                    std::uint16_t       speed,
+                    unsigned short      speed,
                     unsigned char       channel,
                     unsigned char       red,
                     unsigned char       green,
diff --git a/RGBController/RGBController_LogitechG203.cpp b/RGBController/RGBController_LogitechG203.cpp
index aab58dad..1b9b030b 100644
--- a/RGBController/RGBController_LogitechG203.cpp
+++ b/RGBController/RGBController_LogitechG203.cpp
@@ -34,15 +34,21 @@ RGBController_LogitechG203::RGBController_LogitechG203(LogitechG203Controller* l
     mode Cycle;
     Cycle.name       = "Cycle";
     Cycle.value      = LOGITECH_G203_MODE_CYCLE;
-    Cycle.flags      = 0;
+    Cycle.flags      = MODE_FLAG_HAS_SPEED;
     Cycle.color_mode = MODE_COLORS_NONE;
+    Cycle.speed_min  = LOGITECH_G203_SPEED_SLOWEST;
+    Cycle.speed_max  = LOGITECH_G203_SPEED_FASTEST;
+    Cycle.speed      = LOGITECH_G203_SPEED_NORMAL;
     modes.push_back(Cycle);
 
     mode Breathing;
     Breathing.name       = "Breathing";
     Breathing.value      = LOGITECH_G203_MODE_BREATHING;
-    Breathing.flags      = MODE_FLAG_HAS_PER_LED_COLOR;
+    Breathing.flags      = MODE_FLAG_HAS_PER_LED_COLOR | MODE_FLAG_HAS_SPEED;
     Breathing.color_mode = MODE_COLORS_PER_LED;
+    Breathing.speed_min  = LOGITECH_G203_SPEED_SLOWEST;
+    Breathing.speed_max  = LOGITECH_G203_SPEED_FASTEST;
+    Breathing.speed      = LOGITECH_G203_SPEED_NORMAL;
     modes.push_back(Breathing);
 
     SetupZones();
@@ -79,7 +85,7 @@ void RGBController_LogitechG203::DeviceUpdateLEDs()
     unsigned char grn = RGBGetGValue(colors[0]);
     unsigned char blu = RGBGetBValue(colors[0]);
 
-    logitech->SendMouseMode(modes[active_mode].value, 0, red, grn, blu);
+    logitech->SendMouseMode(modes[active_mode].value, modes[active_mode].speed, red, grn, blu);
 }
 
 void RGBController_LogitechG203::UpdateZoneLEDs(int /*zone*/)