diff --git a/Cargo.lock b/Cargo.lock
index 1675b46..a7764fc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,7 +4,7 @@ version = 3
 
 [[package]]
 name = "adb-devices-prometheus-exporter"
-version = "0.1.0"
+version = "0.2.1"
 dependencies = [
  "axum",
  "clap",
diff --git a/Cargo.toml b/Cargo.toml
index dcd0378..bc53ca6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "adb-devices-prometheus-exporter"
-version = "0.1.0"
+version = "0.2.1"
 edition = "2021"
 
 [dependencies]
diff --git a/README.md b/README.md
index fd10775..4d6325c 100644
--- a/README.md
+++ b/README.md
@@ -40,8 +40,14 @@ connected_android_device_state_fastbootd 0
 # HELP connected_android_device_state_bootloader Number of Android devices connected in 'bootloader' status
 # TYPE connected_android_device_state_bootloader gauge
 connected_android_device_state_bootloader 0
+
+# HELP connected_android_device_state_filtered Number of Android devices connected in 'FILTERED' status
+# TYPE connected_android_device_state_filtered gauge
+connected_android_device_state_filtered 0
 ```
 
+* `connected_android_device_state_filtered` is available with -f options in v0.2.1 or newer
+
 ## Usage
 
 ```
@@ -65,6 +71,9 @@ brew install adb-devices-prometheus-exporter
 
 // manage by background service (launchctl on macos)
 brew services start adb-devices-prometheus-exporter
+
+// or, use launchctl instead
+sh install-plist-macos.sh
 ```
 
 access http://0.0.0.0:9001/metrics
diff --git a/install-plist-macos.sh b/install-plist-macos.sh
new file mode 100644
index 0000000..880730e
--- /dev/null
+++ b/install-plist-macos.sh
@@ -0,0 +1,39 @@
+cat > ~/Library/LaunchAgents/com.github.windsekirun.adb-devices-prometheus-exporter.plist <<EOF
+
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>EnvironmentVariables</key>
+	<dict>
+		<key>PATH</key>
+		<string>/opt/homebrew/bin:/opt/homebrew/sbin:/usr/bin:/bin:/usr/sbin:/sbin</string>
+	</dict>
+	<key>KeepAlive</key>
+	<true/>
+	<key>Label</key>
+	<string>com.github.windsekirun.adb-devices-prometheus-exporter</string>
+	<key>LimitLoadToSessionType</key>
+	<array>
+		<string>Aqua</string>
+		<string>Background</string>
+		<string>LoginWindow</string>
+		<string>StandardIO</string>
+		<string>System</string>
+	</array>
+	<key>ProcessType</key>
+	<string>Interactive</string>
+	<key>ProgramArguments</key>
+	<array>
+		<string>/opt/homebrew/opt/adb-devices-prometheus-exporter/bin/adb-devices-prometheus-exporter</string>
+        <string>-f</string>
+	</array>
+	<key>RunAtLoad</key>
+	<true/>
+</dict>
+</plist>
+
+EOF
+
+launchctl load ~/Library/LaunchAgents/com.github.windsekirun.adb-devices-prometheus-exporter.plist
+launchctl start com.github.windsekirun.adb-devices-prometheus-exporter
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 09f5793..a07ec76 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -49,5 +49,6 @@ async fn metrics() -> String {
     result.push_str(&add_device_metrics_state(&device_infos, "offline"));
     result.push_str(&add_device_metrics_state(&device_infos, "fastbootd"));
     result.push_str(&add_device_metrics_state(&device_infos, "bootloader"));
+    result.push_str(&add_device_metrics_state(&device_infos, "FILTERED"));
     return result;
 }
\ No newline at end of file
diff --git a/src/metrics.rs b/src/metrics.rs
index c23e9ce..d3a5f5c 100644
--- a/src/metrics.rs
+++ b/src/metrics.rs
@@ -47,8 +47,10 @@ pub fn add_device_metrics_state(device_infos: &[DeviceInfo], state: &str) -> Str
         .filter(|device| device.state == state)
         .count();
 
+    let lowercase_state = state.to_ascii_lowercase();
+
     let gauge = PrometheusMetricsBuilder::default()
-        .key(format!("connected_android_device_state_{state}"))
+        .key(format!("connected_android_device_state_{lowercase_state}"))
         .value(value)
         .metric_type("gauge")
         .help_str(format!(