diff --git a/.env.example b/.env.example
index 0467a56..a3fec21 100644
--- a/.env.example
+++ b/.env.example
@@ -1,2 +1,4 @@
 HOST=192.168.1.1
 API_KEY=
+UNIFI_USERNAME=
+UNIFI_PASSWORD=
diff --git a/README.md b/README.md
index 7bd0302..6615009 100644
--- a/README.md
+++ b/README.md
@@ -17,18 +17,20 @@ cp .env.example .env
 ```
 
 ```env
-HOST=192.168.1.1  # UniFi controller IP
-API_KEY=          # API key from UniFi OS profile → API Tokens
+HOST=192.168.1.1     # UniFi controller IP
+API_KEY=             # API key from UniFi OS profile → API Tokens
+UNIFI_USERNAME=      # Local UniFi OS username (for speaker volume control)
+UNIFI_PASSWORD=      # Local UniFi OS password
 ```
 
 ## API Reference
 
 [UniFi Protect API v6.2.88](https://developer.ui.com/protect/v6.2.88)
 
-> **Note:** For use cases requiring real-time event subscriptions (WebSocket),
-speaker volume control, or access to settings not exposed by the official API,
-consider [uiprotect](https://github.com/uilibs/uiprotect) — an unofficial Python
-library wrapping the private UniFi Protect API.
+> **Note:** For use cases requiring real-time event subscriptions (WebSocket) or
+access to settings not exposed by the official API, consider
+[uiprotect](https://github.com/uilibs/uiprotect) — an unofficial Python library
+wrapping the private UniFi Protect API.
 
 ## Run
 
diff --git a/dump_camera.py b/dump_camera.py
new file mode 100644
index 0000000..be96563
--- /dev/null
+++ b/dump_camera.py
@@ -0,0 +1,29 @@
+import json
+import os
+
+import httpx
+from dotenv import load_dotenv
+
+load_dotenv()
+
+BASE = f"https://{os.environ['HOST']}/proxy/protect/integration/v1"
+HEADERS = {"X-API-Key": os.environ["API_KEY"]}
+CAMERA_NAME = "G6 Pro 360"
+
+
+def main():
+    with httpx.Client(headers=HEADERS, verify=False) as client:
+        cameras = client.get(f"{BASE}/cameras").raise_for_status().json()
+        camera = next(c for c in cameras if CAMERA_NAME in c["name"])
+
+        print("=== Camera ===")
+        data = client.get(f"{BASE}/cameras/{camera['id']}").raise_for_status().json()
+        print(json.dumps(data, indent=2))
+
+        print("\n=== Sensors ===")
+        sensors = client.get(f"{BASE}/sensors").raise_for_status().json()
+        print(json.dumps(sensors, indent=2))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/main.py b/main.py
index 302dada..c5e4279 100644
--- a/main.py
+++ b/main.py
@@ -6,27 +6,60 @@ from dotenv import load_dotenv
 
 load_dotenv()
 
-API_KEY = os.environ["API_KEY"]
 HOST = os.environ["HOST"]
+API_KEY = os.environ["API_KEY"]
+USERNAME = os.environ["UNIFI_USERNAME"]
+PASSWORD = os.environ["UNIFI_PASSWORD"]
+
 BASE = f"https://{HOST}/proxy/protect/integration/v1"
-HEADERS = {"X-API-Key": API_KEY}
+PRIVATE_BASE = f"https://{HOST}/proxy/protect/api"
+
 CAMERA_NAME = "G6 Pro 360"
 AUDIO_FILE = "./data/hello.wav"
-VOLUME = 1.0  # 10%
+SPEAKER_VOLUME = 50  # 0-100
+
+
+def set_speaker_volume(camera_id: str, volume: int):
+    # Accept-Encoding must be suppressed at request level — server returns 403 when present
+    with httpx.Client(verify=False, http2=True) as client:
+        res = client.post(
+            f"https://{HOST}/api/auth/login",
+            content=f'{{"username":"{USERNAME}","password":"{PASSWORD}","rememberMe":false}}'.encode(),
+            headers={"Content-Type": "application/json", "Accept-Encoding": ""},
+        )
+        res.raise_for_status()
+        csrf = res.headers.get("x-csrf-token")
+
+        def get_volumes():
+            s = client.get(f"{PRIVATE_BASE}/cameras/{camera_id}").raise_for_status().json()["speakerSettings"]
+            return s["volume"], s["speakerVolume"]
+
+        before = get_volumes()
+        print(f"Speaker volume before: volume={before[0]} speakerVolume={before[1]}")
+
+        client.patch(
+            f"{PRIVATE_BASE}/cameras/{camera_id}",
+            headers={"x-csrf-token": csrf},
+            json={"speakerSettings": {"volume": volume, "speakerVolume": volume}},
+        ).raise_for_status()
+
+        after = get_volumes()
+        print(f"Speaker volume after:  volume={after[0]} speakerVolume={after[1]}")
 
 
 def main():
-    with httpx.Client(headers=HEADERS, verify=False) as client:
+    with httpx.Client(headers={"X-API-Key": API_KEY}, verify=False) as client:
         cameras = client.get(f"{BASE}/cameras").raise_for_status().json()
         camera = next(c for c in cameras if CAMERA_NAME in c["name"])
         print(f"Camera: {camera['name']} ({camera['id']})")
 
+        set_speaker_volume(camera["id"], SPEAKER_VOLUME)
+
         session = client.post(f"{BASE}/cameras/{camera['id']}/talkback-session").raise_for_status().json()
         print(f"Talkback: {session['url']} ({session['codec']} {session['samplingRate']}Hz)")
 
         proc = subprocess.Popen([
             "ffmpeg", "-re", "-i", AUDIO_FILE,
-            "-af", f"volume={VOLUME}",
             "-acodec", "libopus",
             "-ar", str(session["samplingRate"]),
             "-ac", "1",
diff --git a/pyproject.toml b/pyproject.toml
index 16e8013..92970e3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,6 +5,6 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.14"
 dependencies = [
-    "httpx>=0.28.1",
+    "httpx[http2]>=0.28.1",
     "python-dotenv>=1.2.1",
 ]
diff --git a/uv.lock b/uv.lock
index 3a8e44d..967112e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -28,13 +28,13 @@ name = "g6pro360"
 version = "0.1.0"
 source = { virtual = "." }
 dependencies = [
-    { name = "httpx" },
+    { name = "httpx", extra = ["http2"] },
     { name = "python-dotenv" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "httpx", specifier = ">=0.28.1" },
+    { name = "httpx", extras = ["http2"], specifier = ">=0.28.1" },
     { name = "python-dotenv", specifier = ">=1.2.1" },
 ]
 
@@ -47,6 +47,28 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl", hash = "sha256:63cf8bbe7522de3bf65932fda1d9c2772064ffb3dae62d55932da54b31cb6c86", size = 37515, upload-time = "2025-04-24T03:35:24.344Z" },
 ]
 
+[[package]]
+name = "h2"
+version = "4.3.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "hpack" },
+    { name = "hyperframe" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/1d/17/afa56379f94ad0fe8defd37d6eb3f89a25404ffc71d4d848893d270325fc/h2-4.3.0.tar.gz", hash = "sha256:6c59efe4323fa18b47a632221a1888bd7fde6249819beda254aeca909f221bf1", size = 2152026, upload-time = "2025-08-23T18:12:19.778Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/69/b2/119f6e6dcbd96f9069ce9a2665e0146588dc9f88f29549711853645e736a/h2-4.3.0-py3-none-any.whl", hash = "sha256:c438f029a25f7945c69e0ccf0fb951dc3f73a5f6412981daee861431b70e2bdd", size = 61779, upload-time = "2025-08-23T18:12:17.779Z" },
+]
+
+[[package]]
+name = "hpack"
+version = "4.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/2c/48/71de9ed269fdae9c8057e5a4c0aa7402e8bb16f2c6e90b3aa53327b113f8/hpack-4.1.0.tar.gz", hash = "sha256:ec5eca154f7056aa06f196a557655c5b009b382873ac8d1e66e79e87535f1dca", size = 51276, upload-time = "2025-01-22T21:44:58.347Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/07/c6/80c95b1b2b94682a72cbdbfb85b81ae2daffa4291fbfa1b1464502ede10d/hpack-4.1.0-py3-none-any.whl", hash = "sha256:157ac792668d995c657d93111f46b4535ed114f0c9c8d672271bbec7eae1b496", size = 34357, upload-time = "2025-01-22T21:44:56.92Z" },
+]
+
 [[package]]
 name = "httpcore"
 version = "1.0.9"
@@ -75,6 +97,20 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/2a/39/e50c7c3a983047577ee07d2a9e53faf5a69493943ec3f6a384bdc792deb2/httpx-0.28.1-py3-none-any.whl", hash = "sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad", size = 73517, upload-time = "2024-12-06T15:37:21.509Z" },
 ]
 
+[package.optional-dependencies]
+http2 = [
+    { name = "h2" },
+]
+
+[[package]]
+name = "hyperframe"
+version = "6.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/02/e7/94f8232d4a74cc99514c13a9f995811485a6903d48e5d952771ef6322e30/hyperframe-6.1.0.tar.gz", hash = "sha256:f630908a00854a7adeabd6382b43923a4c4cd4b821fcb527e6ab9e15382a3b08", size = 26566, upload-time = "2025-01-22T21:41:49.302Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/48/30/47d0bf6072f7252e6521f3447ccfa40b421b6824517f82854703d0f5a98b/hyperframe-6.1.0-py3-none-any.whl", hash = "sha256:b03380493a519fce58ea5af42e4a42317bf9bd425596f7a0835ffce80f1a42e5", size = 13007, upload-time = "2025-01-22T21:41:47.295Z" },
+]
+
 [[package]]
 name = "idna"
 version = "3.11"