diff --git a/README.md b/README.md
index 911835a..a252887 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ When **Steamless Mode** is active, the app disables the controller's built-in ke
 ### To run
 - Windows 10 or later (64-bit)
 - [ViGEmBus](https://github.com/nefarius/ViGEmBus/releases/latest) driver installed
-- Steam Controller — wired USB (PID `0x1302`), wireless dongle (PID `0x1304`), or Bluetooth LE (PID `0x1303`, pair via Windows Bluetooth settings)
+- 2026 Steam Controller (Triton) — wired USB (PID `0x1302`), Bluetooth LE (PID `0x1303`, pair via Windows Bluetooth settings), Proteus/Puck receiver (PID `0x1304`), or Nereid receiver (PID `0x1305`)
 - Steam **closed**, or a coexistence strategy selected from the tray's debug menu
 
 ### To build
@@ -79,13 +79,13 @@ Steam normally opens the physical Steam Controller even while the client is idle
 The tray's **Debug: Steam coexistence** submenu can apply one of three strategies. Hover an option to see its tradeoffs; selecting one safely releases the controller, closes Steam, applies the setting, and relaunches Steam immediately. If a Steam game is running, the app asks before closing it.
 
 - **Restore Steam's original controller settings** is the explicit off switch. It restores the Valve PID blacklist and `-nojoy` state recorded before SteamlessController first changed them, then SteamlessController yields whenever Steam can see the physical controller.
-- **Reserve Steam Controller for Steamless** is recommended for Game Pass. It adds only the three Steam Controller product IDs to Steam's per-device blacklist, leaving Steam Input available for other controller types. Steam Controller-specific layouts, gyro, and touch menus are unavailable in Steam.
+- **Reserve Steam Controller for Steamless** is recommended for Game Pass. It adds only the four supported 2026 Steam Controller product IDs to Steam's per-device blacklist, leaving Steam Input available for other controller types. Steam Controller-specific layouts, gyro, and touch menus are unavailable in Steam.
 - **Disable all Steam controller support (`-nojoy`)** disables all Steam client controller support, including Steam Input and Big Picture controller navigation. The app adds the flag to Steam's existing Windows startup entry; launching Steam another way without the flag is detected and SteamlessController safely yields.
 
 The blacklist option backs up `config/config.vdf` to `config/config.vdf.steamlesscontroller.bak`, preserves unrelated blacklist entries, and manages this property inside the outer `InstallConfigStore` object:
 
 ```vdf
-"controller_blacklist" "28de/1302,28de/1303,28de/1304"
+"controller_blacklist" "28de/1302,28de/1303,28de/1304,28de/1305"
 ```
 
 SteamlessController verifies both the setting and Steam's current `logs/controller.txt` session before treating the blacklist as safe. For `-nojoy`, it verifies the running `steam.exe` command line through Windows Management Instrumentation. Missing or stale evidence always makes SteamlessController yield rather than risk duplicate input.
diff --git a/src/app/SteamStrategy.cpp b/src/app/SteamStrategy.cpp
index c92d5f8..7b8b4d9 100644
--- a/src/app/SteamStrategy.cpp
+++ b/src/app/SteamStrategy.cpp
@@ -20,8 +20,8 @@ constexpr wchar_t STRATEGY_VALUE[] = L"SteamStrategy";
 constexpr wchar_t BASELINE_CAPTURED_VALUE[] = L"SteamBaselineCaptured";
 constexpr wchar_t BASELINE_BLACKLIST_VALUE[] = L"SteamBaselineBlacklistMask";
 constexpr wchar_t BASELINE_NOJOY_VALUE[] = L"SteamBaselineNoJoy";
-constexpr std::array<const char*, 3> STEAM_CONTROLLER_IDS = {
-    "28de/1302", "28de/1303", "28de/1304"
+constexpr std::array<const char*, 4> STEAM_CONTROLLER_IDS = {
+    "28de/1302", "28de/1303", "28de/1304", "28de/1305"
 };
 constexpr DWORD ALL_STEAM_CONTROLLER_IDS =
     (1u << STEAM_CONTROLLER_IDS.size()) - 1u;
diff --git a/src/app/SteamWatcher.cpp b/src/app/SteamWatcher.cpp
index 4b4617a..d866c2a 100644
--- a/src/app/SteamWatcher.cpp
+++ b/src/app/SteamWatcher.cpp
@@ -244,7 +244,9 @@ static bool IsControllerHiddenFromSteam(const SteamProcess& steam) {
         return ReportControllerHidden(false, "current controller session unavailable");
     const std::string session = log.substr(sessionPos);
 
-    constexpr const char* ids[] = {"28de/1302", "28de/1303", "28de/1304"};
+    constexpr const char* ids[] = {
+        "28de/1302", "28de/1303", "28de/1304", "28de/1305"
+    };
     bool hidden = false;
     for (const char* id : ids) {
         std::string type(id);
diff --git a/src/steam/SteamController.cpp b/src/steam/SteamController.cpp
index 491d1a5..41c9b76 100644
--- a/src/steam/SteamController.cpp
+++ b/src/steam/SteamController.cpp
@@ -54,7 +54,8 @@ static constexpr uint8_t HAPTIC_COMMAND_CLICK = 2;
 
 std::vector<std::wstring> SteamController::EnumerateAll() {
     std::vector<std::wstring> result;
-    for (uint16_t pid : { SC2026_PID, SC2026_BT_PID, SC2026_DONGLE_PID })
+    for (uint16_t pid : { SC2026_PID, SC2026_BT_PID, SC2026_DONGLE_PID,
+                          SC2026_NEREID_DONGLE_PID })
         for (auto const& path : HidDevice::Enumerate(
                  VALVE_VID, pid, VENDOR_USAGE_PAGE, CONTROLLER_USAGE))
             result.push_back(path);
@@ -72,7 +73,8 @@ SteamController::Transport SteamController::TransportFromPath(const std::wstring
         p.find(L"bthledevice") != std::wstring::npos ||
         p.find(L"bthenum") != std::wstring::npos)
         return Transport::Bluetooth;
-    if (p.find(L"pid_1304") != std::wstring::npos)
+    if (p.find(L"pid_1304") != std::wstring::npos ||
+        p.find(L"pid_1305") != std::wstring::npos)
         return Transport::Dongle;
     if (p.find(L"pid_1302") != std::wstring::npos ||
         p.find(L"pid_1303") != std::wstring::npos)
@@ -92,8 +94,8 @@ const char* SteamController::TransportName(Transport t) {
 bool SteamController::Open() {
     auto paths = EnumerateAll();
     if (paths.empty()) {
-        printf("No Steam Controller found (wired PID=%04X or dongle PID=%04X).\n",
-               SC2026_PID, SC2026_DONGLE_PID);
+        printf("No Steam Controller found (wired PID=%04X or dongle PIDs=%04X/%04X).\n",
+               SC2026_PID, SC2026_DONGLE_PID, SC2026_NEREID_DONGLE_PID);
         return false;
     }
 
diff --git a/src/steam/SteamController.h b/src/steam/SteamController.h
index 6ccac35..8aab57c 100644
--- a/src/steam/SteamController.h
+++ b/src/steam/SteamController.h
@@ -9,9 +9,10 @@
 class SteamController {
 public:
     static constexpr uint16_t VALVE_VID        = 0x28DE;
-    static constexpr uint16_t SC2026_PID       = 0x1302;  // wired USB
-    static constexpr uint16_t SC2026_BT_PID    = 0x1303;  // Bluetooth LE (HID over GATT)
-    static constexpr uint16_t SC2026_DONGLE_PID = 0x1304; // wireless dongle ("Steam Controller Puck")
+    static constexpr uint16_t SC2026_PID        = 0x1302; // wired USB
+    static constexpr uint16_t SC2026_BT_PID     = 0x1303; // Bluetooth LE (HID over GATT)
+    static constexpr uint16_t SC2026_DONGLE_PID = 0x1304; // Proteus dongle ("Steam Controller Puck")
+    static constexpr uint16_t SC2026_NEREID_DONGLE_PID = 0x1305; // Nereid receiver
 
     // How the controller is linked to the PC. Bluetooth is detected from the
     // device interface path (HOGP service GUID / bthenum), the other two by PID.