diff --git a/README.md b/README.md
index 57334d1..53430ce 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,3 @@
 # Custom OpenWRT image for MR200
+
+Script `files/etc/rc.local` requires `curl` package.
diff --git a/files/etc/rc.local b/files/etc/rc.local
new file mode 100644
index 0000000..288feb7
--- /dev/null
+++ b/files/etc/rc.local
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+/root/led.sh > /dev/null
diff --git a/files/root/led.sh b/files/root/led.sh
new file mode 100755
index 0000000..dd24162
--- /dev/null
+++ b/files/root/led.sh
@@ -0,0 +1,94 @@
+#!/bin/sh
+
+eval hash_LED_signal1=none
+eval hash_LED_signal2=none
+eval hash_LED_signal3=none
+eval hash_LED_signal4=none
+eval hash_LED_4g=none
+
+change_led() {
+
+#    echo debug: change_led "$1" "$2"
+
+    echo "$2" > /sys/class/leds/mr200\:white\:$1/trigger
+}
+
+led_on() {
+
+  export key=LED_$1
+
+  if [ $(eval "echo \$hash_$key") != "default-on" ]; then
+
+    change_led $1 "default-on"
+    eval hash_$key="default-on"
+
+  fi
+}
+
+led_off() {
+
+  export key=LED_$1                                     
+
+  if [ $(eval "echo \$hash_$key") != "none" ]; then
+
+    change_led $1 "none"
+    eval hash_$key="none"
+
+  fi                                                     
+
+}
+
+update_led_status() {
+    $(curl -s -d '{"module":"status", "action":"0"}' -H "Content-Type: application/json" -X POST http://192.168.225.1/cgi-bin/qcmap_web_cgi \
+| jsonfilter -e 'SIGNALSTRENGTH=@.wan.signalStrength' -e 'NETWORKTYPE=@.wan.networkType')
+
+    case $SIGNALSTRENGTH in
+        "0;")
+            led_off signal1
+            led_off signal2
+            led_off signal3
+            led_off signal4
+            ;;
+        "1;")
+            led_on signal1
+            led_off signal2
+            led_off signal3
+            led_off signal4
+            ;;
+        "2;")
+            led_on signal1
+            led_on signal2
+            led_off signal3
+            led_off signal4
+            ;;
+        "3;")
+            led_on signal1
+            led_on signal2
+            led_on signal3
+            led_off signal4
+            ;;
+        "4;")
+            led_on signal1
+            led_on signal2
+            led_on signal3
+            led_on signal4
+            ;;
+    esac
+
+    case $NETWORKTYPE in
+        "3;")
+            led_on 4g
+            ;;
+        *)
+            led_off 4g
+            ;;
+    esac
+}
+
+led_status_loop() {
+    while sleep 10; do
+        update_led_status
+    done
+}
+
+led_status_loop &