diff --git a/src/c/main.c b/src/c/main.c
index b366ff6..51239ab 100644
--- a/src/c/main.c
+++ b/src/c/main.c
@@ -332,6 +332,13 @@ static void main_window_unload(Window *window) {
 	animation_destroy(s_head_out_template);
 }
 
+static void bluetooth_callback(bool connected) {
+    replace_gbitmap_color(GColorLightGray, GColorBlack, s_bt_icon, s_bt_layer);
+    if (!connected) {
+        replace_gbitmap_color(GColorBlack, GColorLightGray, s_bt_icon, s_bt_layer);
+    }
+}
+
 // DEBUG buttons
 static void up_single_click_handler(ClickRecognizerRef recognizer, void *context) {
 	Window *window = (Window *)context;
@@ -442,6 +449,9 @@ static void init() {
 	// show the Window on the watch, with animated=true
 	window_stack_push(s_main_window, true);
 
+	// register with ConnectionService (bluetooth status)
+	connection_service_subscribe((ConnectionHandlers){.pebble_app_connection_handler=bluetooth_callback});
+
 	// register with TickTimerService
 	tick_timer_service_subscribe(MINUTE_UNIT, minute_handler);