diff --git a/changelog.txt b/changelog.txt
index 9899a6e..e364dc2 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,3 +1,6 @@
+V1.4273 2026-11-02 For all tinySA Ultra models
+- The tinySA Ultra has its own USB IDs: VID 0x1781 PID 0x0A44 (was 0x0483 0x5740, the ST virtual COM port). Windows assigns a new COM port once, programs that look for the tinySA by its USB IDs need an update (tinySA-App accepts both)
+
 V1.4270 2026-11-01 For all tinySA models
 - Trigger lines can be dragged with the touch screen, in multi band mode the trigger line of each band (multi band Ultra only)
 - The trigger LEVEL button shows the level in the selected unit instead of the dBm value
diff --git a/usbcfg.c b/usbcfg.c
index 20d500e..928a4ec 100644
--- a/usbcfg.c
+++ b/usbcfg.c
@@ -30,6 +30,18 @@ SerialUSBDriver SDU1;
 #define USBD1_DATA_AVAILABLE_EP         1
 #define USBD1_INTERRUPT_REQUEST_EP      2
 
+/*
+ * USB vendor and product ID: the tinySA ULTRA has its own, the tinySA keeps
+ * the ST virtual COM port pair.
+ */
+#ifdef TINYSA4
+#define USB_VID                         0x1781
+#define USB_PID                         0x0A44
+#else
+#define USB_VID                         0x0483  /* ST */
+#define USB_PID                         0x5740
+#endif
+
 /*
  * USB Device Descriptor.
  */
@@ -41,8 +53,8 @@ static const uint8_t vcom_device_descriptor_data[18] = {
                          0x02,          /* bDeviceSubClass (Common Class).  */
                          0x01,          /* bDeviceProtocol (IAD).           */
                          0x40,          /* bMaxPacketSize.                  */
-                         0x0483,        /* idVendor (ST).                   */
-                         0x5740,        /* idProduct.                       */
+                         USB_VID,       /* idVendor.                        */
+                         USB_PID,       /* idProduct.                       */
                          0x0201,        /* bcdDevice, changed with the
                                            composite layout so that Windows
                                            selects the drivers again.       */
@@ -56,8 +68,8 @@ static const uint8_t vcom_device_descriptor_data[18] = {
                          0x00,          /* bDeviceSubClass.                 */
                          0x00,          /* bDeviceProtocol.                 */
                          0x40,          /* bMaxPacketSize.                  */
-                         0x0483,        /* idVendor (ST).                   */
-                         0x5740,        /* idProduct.                       */
+                         USB_VID,       /* idVendor.                        */
+                         USB_PID,       /* idProduct.                       */
                          0x0200,        /* bcdDevice.                       */
                          1,             /* iManufacturer.                   */
                          2,             /* iProduct.                        */